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Selected Publications

1.  Observation of ultrahigh-temperature ferromagnetic-like transition in iron-contaminated multiwalled carbon nanotube mats.  G. M. Zhao and P. Beeli, Phys. Rev. B 77, 245433 (2008).

2.    Unusual temperature dependence of the oxygen-isotope effect on the exchange energy of La1-xCaxMnO3+y at high temperatures.  G. M. Zhao and J. Mann, Phys. Rev. B (Rapid Communications) 77, 100406(R) (2008).

3.     Substantial oxygen-isotope effect  in heavily overdoped Y1-xCaxBa2Cu3O7-y: Quantitative agreement with a phonon-mediated model. J. Mann, P. Beeli, and   G. M. Zhao, submitted to Phys. Rev. B.

4.   Comment on "Isotope effect in high-Tc superconductors". A. S. Alexandrov and   G. M. Zhao, submitted to Phys. Rev. B.

5.     Evidence for very strong electron-phonon coupling in YBa2Cu3O6.  G. M. Zhao, Phys. Rev. B 75, 104511 (2007).

6.       Precise determination of the superconducting gap along the diagonal direction of Bi2Sr2CaCu2O8+y: Evidence for extended s-wave gap symmetry. G. M. Zhao, Phys. Rev. B (Rapid Communications) 75, 140510(R) (2007).

7.       Strong coupling to multiple phonon modes in high-temperature superconductors. G. M. Zhao, Phys. Rev. B 75, 214507 (2007).

8.       Muon-spin-relaxation and magnetic measurements on Ba0.63K0.37BiO3: Evidence for polaronic strong-coupling phonon-mediated pairing.  G. M. Zhao, Phys. Rev. B (Rapid Communications) 76, 020501(R) (2007).

9.       Polarons in colossal magnetoresistive and high-temperature superconducting materials. G. M. Zhao, Polarons in Advanced Materials (Springer Series in Materials Science 103), edited by A. S. Alexandrov (Canopus Publishing Ltd, Bristol, UK, 2007) page 569-597.

10.   Evidence for room-temperature superconductivity in carbon nanotubes.  G. M. Zhao, New Research on Superconductivity,  edited by B. P. Martin (Nova Science Publishers, Inc., New York, 2007) page 21-57.

11.   Pairing interactions and pairing mechanism in high temperature copper oxide superconductors. G. M. Zhao, Phys. Rev. B 71, 104517 (2005).

12.  Quantitative test of a quantum theory for the resistive transition in a superconducting single-walled carbon nanotube bundle. G. M. Zhao, Phys. Rev. B 71, 113404 (2005).

13.  Arguments for quasi-one-dimensional room-temperature superconductivity in carbon nanotubes. G. M.  Zhao,  Molecular Nanowires and Other Quantum Objects,  edited by A. S. Alexandrov, J. Demsar and I. K. Yanson (Nato Science Series, Kluwer Academic Publishers, Netherlands, 2004) page 95-106.

14.  The magnetic resonance in high-temperature superconductors: Evidence for an extended s-wave pairing symmetry. G. M. Zhao, Phil. Mag. B 84, 3869 (2004).

15.  Unambiguous evidence for extended s-wave pairing symmetry in hole-doped high-temperature superconductors. G. M. Zhao, Phil. Mag. B 84, 3861 (2004).

16.  Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extended s wave with eight line nodes.    G. M. Zhao, Phys. Rev. B 64, 024503 (2001).

17.  Strong oxygen-isotope effect on the intrinsic resistivity in the ferromagnetic state of manganites. G. M. Zhao, D. J. Kang, W. Prellier, M. Rajeswari, H. Keller, T. Venkatesan, & R. L. Greene, Phys. Rev. B (Rapid Communications) 63, R60402 (2001).

18.  Experimental constraints on the physics of cuprates. G. M. Zhao, invited review article, Phil. Mag. B 81, 1335 (2001).

19.  Bulk experimental evidence of half-metallic ferromagnetism in doped manganites. G. M. Zhao, H. Keller, W. Prellier, & D. J. Kang, Phys. Rev. B 63, 172411 (2001).

20.  Isotope effects and possible pairing mechanism in optimally doped cuprate superconductors. G. M. Zhao, V. Kirtikar, & D. E. Morris, Phys. Rev. B (Rapid Communications) 63, 220506 (2001).

21.  Unconventional isotope effects in the high-temperature cuprate superconductors. G. M. Zhao, H. Keller, & K. Conder, review article, J. Phys.: Condens. Matter 13, R569 (2001).

22.  Evidence for polaronic Fermi-liquid in doped manganites. A. S. Alexandrov, G. M. Zhao, H. Keller, B. Lorenz, Y. S. Wang, & C. W. Chu, Phys. Rev. B (Rapid Communications) 64, 140404 (2001).

23.  Double-exchange and the cause of the ferromagnetism in doped manganites. G. M. Zhao, Phys. Rev. B 62, 11 639 (2000).

24.  Large oxygen-isotope effect in Sr0.4K0.6BiO3: Evidence for phonon-mediated superconductivity. G. M. Zhao, K.Conder, M.Angst, S. M. Kazakov, J. Karpinski, M. Maciejewski, C. Bougerol, J. S. Pshirkov, & E. V. Antipov, Phys. Rev. B (Rapid Communications) 62, R11 977 (2000).

25.  Evidence for the immobile bipolaron formation in the paramagnetic state of the magnetoresistive manganites. G. M. Zhao, Y. S. Wang, D. J. Kang, W. Prellier, M. Rajeswari, H. Keller, T.Venkatesan, C. W. Chu, & R. L. Greene, Phys. Rev. B (Rapid Communications) 62, R11 949 (2000).

26.  Electrical transport in the ferromagnetic state of manganites: Small polaron metallic conduction at low temperatures. G. M. Zhao, V. Smolyaninova, W. Prellier, & H. Keller, Phys. Rev. Lett. 84, 6086 (2000).

27.  Very strong magnetic-field dependence of the oxygen isotope shift of the charge-ordering transition in La0.5Ca0.5MnO3. G. M. Zhao, K. Ghosh, H. Keller, & R. L. Greene, Phys. Rev. B 59, 81 (1999).

28.  Oxygen isotope effects in manganites: Evidence for (bi)polaronic charge carriers. G. M. Zhao, H. Keller, R. L. Greene, & K. A. Muller, Physics of Manganites (Kluwer Academic/Plenum publisher, New York, 1999) eds. T. A. Kaplan & S. D. Mahanti, page 221-241 (invited review article).

29.  Giant oxygen isotope effect on the spin glass transition in La2-xSrxCu1-zMnzO4 as revealed by muon spin rotation. A. Shengelaya, G. M. Zhao, C. M. Aegerter, K. Conder, I. M. Savic, & H. Keller, Phys. Rev. Lett. 83, 5142 (1999).

30.  Oxygen isotope shift of the charge-stripe ordering temperature in La2-xSrxCuO4 from x-ray absorption spectroscopy. A. Lanzara, G. M. Zhao, N. L. Saini, A. Bianconi, K. Conder, H. Keller, & K. A. Muller, J. Phys.: Condens. Matter 11, L541 (1999).

31.  The ratio of small polarons to free carriers in La2-xSrxCuO4 derived from susceptibility measurements. K. A. Muller, G. M. Zhao, K. Conder, & H. Keller, J. Phys.: Condens. Matter 10, L291 (1998).

32.  Colossal oxygen isotope shift of the charge-ordering transition in Nd0.5Sr0.5MnO3. G. M. Zhao, K. Ghosh, & R. L. Greene, J. Phys.: Condens. Matter 10, L737 (1998).

33.  Evidence for polaronic supercarriers in the copper oxide superconductors La2-xSrxCuO4. G. M. Zhao, M. B. Hunt, H. Keller, & K. A. Muller, Nature 385, 236 (1997).

34.  Strong oxygen-mass dependence of the thermal-expansion coefficient in the manganites (La1-xCax)1-yMn1-yO3. G. M. Zhao, M. B. Hunt, & H. Keller, Phys. Rev. Lett. 78, 955 (1997).

35.  Site dependence of large oxygen isotope effect in Y0.7Pr0.3Ba2Cu3O6.97. G. M. Zhao, J. W. Ager III, & D. E. Morris, Phys. Rev. B 54, 14982 (1996).

36.  Giant oxygen isotope shift in the magnetoresistive perovskite La1-xCaxMnO3+y. G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, Nature 381, 676 (1996).

37.  EPR evidence of Jahn-Teller polaron formation in La1-xCaxMnO3+y. A. Shengelaya, G. M. Zhao, H. Keller, & K. A. Müller, Phys. Rev. Lett. 77, 5296 (1996).

38.  Composition dependence of the oxygen isotope effect in Ba1-xKxBiO3: Evidence for oxygen-mass dependence of the coupling constant.     G. M. Zhao & D. E. Morris, Phys. Rev. B 51, 12848 (1995).

39.  Observation of possible oxygen isotope effect on the effective mass of carriers in YBa2Cu3O6.94. G. M. Zhao & D. E. Morris, Phys. Rev. B (Rapid communications) 51, 16487 (1995).

40.  Oxygen isotope effect on the effective mass of carriers from magnetic measurements on La2-xSrxCuO4. G. M. Zhao, K. K. Singh, A. P. B. Sinha, & D. E. Morris, Phys. Rev. B 52, 6840 (1995).

41.  Oxygen isotope effect on Neel temperature in various antiferromagnetic cuprates.  G. M. Zhao, K. K. Singh, & D. E. Morris, Phys. Rev. B 50, 4112 (1994).

42.  Experimental features of antiferromagnetism in GdBa2Cu3O7-y.  G. M. Zhao, R. L. Wang, H. C. Li, Q. Z. Ran, C. X. Zhu, L. Li, & W. Y. Guan, Phys. Rev. B 38, 5035 (1988).

43.  A method for preparing superconducting single crystals of GdBa2Cu3O7-y. R. X. Wan, G. M. Zhao, X. M. Tang, W. Z. Li, S. Z. Hu, & H. N. Yao, J. Appl. Phys. 64, 3754 (1988).

 

Full Publication List (90)

2008

1.       Observation of ultrahigh-temperature ferromagnetic-like transition in iron-contaminated multiwalled carbon nanotube mats.   

       G. M. Zhao and P. Beeli, Phys. Rev. B 77, 245433 (2008).

2.       Unusual temperature dependence of the oxygen-isotope effect on the exchange energy of La1-xCaxMnO3+y at high

       temperatures.  G. M. Zhao and J. Mann, Phys. Rev. B (Rapid Communications) 77, 100406(R) (2008).

3.       Substantial oxygen-isotope effect  in heavily overdoped Y1-xCaxBa2Cu3O7-y: Quantitative agreement with a phonon-mediated

       model. J. Mann, P. Beeli, and   G. M. Zhao, submitted to Phys. Rev. B.

4.       Comment on "Isotope effect in high-Tc superconductors". A. S. Alexandrov and   G. M. Zhao, submitted to Phys. Rev. B.

2007

5.       Evidence for very strong electron-phonon coupling in YBa2Cu3O6

      G. M.  Zhao, Phys. Rev. B 75, 104511 (2007).

6.       Precise determination of the superconducting gap along the diagonal direction of Bi2Sr2CaCu2O8+y:  Evidence for extended s-wave gap symmetry

G. M.  Zhao, Phys. Rev. B (Rapid Communications) 75, 140510(R) (2007).

7.       Strong coupling to multiple phonon modes in high-temperature superconductors

G. M.  Zhao, Phys. Rev. B 75, 214507 (2007).

8.       Muon-spin-relaxation and magnetic measurements on Ba0.63K0.37BiO3: Evidence for polaronic strong-coupling phonon-mediated pairing

G. M.  Zhao, Phys. Rev. B (Rapid Communications) 76, 020501(R) (2007).

9.       Polarons in colossal magnetoresistive and high-temperature superconducting materials

G. M.  Zhao, Polarons in Advanced Materials,(Springer Series in Materials Science 103), edited by A. S. Alexandrov (Canopus Publishing Ltd, Bristol, UK, 2007) page 569-597.

10.   Evidence for room-temperature superconductivity in carbon nanotubes

      G. M.  Zhao,  New Research on Superconductivity,  edited by B. P. Martin

      (Nova Science Publishers, Inc., New York, 2007) page 21-57.

 

2006

 

11.  Compelling evidence for high temperature superconductivity in carbon nanotubes

      G. M.  Zhao,  Trends in Nanotubes Research, edited by D. A. Martin

      (Nova Science Publishers, Inc., New York, 2006) page 39-75.

12. Very unusual magnetic properties of multi-walled carbon nanotube mat

G. M.  Zhao & P. Beeli, submitted to Physical Review Letters.

 

2005

 

13.   Pairing interactions and pairing mechanism in high temperature copper oxide superconductors.

G. M.  Zhao, Phys. Rev. B 71, 104517 (2005).

14.  Quantitative test of a quantum theory for the resistive transition in a superconducting single-walled carbon nanotube bundle.             

G. M. Zhao, Phys. Rev. B 71, 113404 (2005).

15.  Magnetic and electrical evidence for hot superconductivity in multi-walled carbon nanotubes

G. M. Zhao & P. Beeli, submitted to Phys. Rev. B.

 

2004

 

16.  The resistive transition and Meissner effect in carbon nanotubes: Evidence for quasi-one-dimensional superconductivity above room temperature

G. M. Zhao, cond-mat/0412382.

17.  Reply to comment on ??Evidence for the immobile bipolaron formation in the paramagnetic state of the magnetoresistive manganites??

G. M. Zhao, submitted to Phys. Rev. B.

18.  Arguments for quasi-one-dimensional room-temperature superconductivity in carbon nanotubes.

G. M.  Zhao,  Molecular Nanowires and Other Quantum Objects,  edited by A. S. Alexandrov, J. Demsar and I. K. Yanson (Nato Science Series, Kluwer Academic Publishers, Netherlands, 2004) page 95-106.

19.  The magnetic resonance in high-temperature superconductors:  Evidence for an extended s-wave pairing symmetry.

G. M. Zhao, Phil. Mag. B 84, 3869 (2004).

20.  Unambiguous evidence for extended s-wave pairing symmetry in hole-doped high-temperature superconductors.

G. M. Zhao, Phil. Mag. B 84, 3861 (2004).

 

2003

 

21.  Is room temperature superconductivity in carbon nanotubes too wonderful to believe?

G. M.  Zhao, Cond-mat/0307770.

 

2002

 

22.  Oxygen-isotope effects on local structure distortions and transport properties of the epitaxial thin films of Nd0.67Sr0.33MnO3.

R. P. Sharma, G. M. Zhao, D. J. Kang, M. Robson, M. Rajeswari, H. Keller, S. Ogale, H. D. Drew,  & T. Venkatesan, Phys. Rev. B 66, 214411 (2002).

23.  Unconventional phonon-mediated superconductivity in MgB2

G. M. Zhao, New Journal of Phys. 4, 3.1 (2002).

24.  Influence of oxygen isotope exchange on the ground state of manganites

V. N. Smolyaninova, Amlan Biswas, P. Fournier, S. Loand, X. Zhang,  G. M.  Zhao, & R. L. Greene, Phys. Rev. B 65, 104419 (2002).

25.  Oxygen stoichiometry and isotope effect in La1-xCaxMnO3+d.

K. Conder, G. M.  Zhao, & R. Khsanov, Phys. Rev. B 66, 212409 (2002).

26.  Transport and magnetic properties in multi-walled carbon nanotube ropes: Evidence for superconductivity above room temperature.

G. M. Zhao, Cond-mat/0208197 (submitted to Phys. Rev. B in July 2003).

27.  Quasi-one-dimensional superconductivity above 300 K and quantum phase slips in individual carbon nanotubes.

G. M. Zhao, Cond-mat/0208198 (submitted to Phys. Rev. B in July 2003).

28.  Raman spectroscopic evidence for superconductivity at 645 K in single-walled carbon nanotubes.

G. M. Zhao, Cond-mat/0208200 (submitted to Phys. Rev. Lett.  in July 2003).

29.  Carbon nanotubes: Ballistic transport or room-temperature superconductivity?

G. M. Zhao, Cond-mat/0208201 (submitted to Phys. Rev. Lett. in July 2003).

 

2001

 

30.  Possible superconductivity above 400 K in carbon multi-wall nanotubes.

G. M. Zhao & Y. S. Wang, Cond-mat/0111268.

31.  Evidence for two s-wave gaps in MgB2.

G. M. Zhao (submitted to Phys. Rev. Lett.  in August 2001).

32.  Identification of the bulk pairing symmetry in high-temperature superconductors: Evidence for an extended s wave with eight line nodes.

G. M.  Zhao, Phys. Rev. B 64, 024503 (2001).

33.  Strong oxygen-isotope effect on the intrinsic resistivity in the ferromagnetic state of manganites.

G. M.  Zhao, D. J. Kang, W. Prellier, M. Rajeswari, H. Keller, T. Venkatesan, & R. L. Greene, Phys. Rev. B (Rapid Communications) 63, R60402 (2001).

34.  Experimental constraints on the physics of cuprates.

G. M.  Zhao, invited review article, Phil. Mag. B 81, 1335 (2001).

35.  Bulk experimental evidence of half-metallic ferromagnetism in doped manganites.

G. M.  Zhao, H. Keller, W. Prellier, & D. J. Kang, Phys. Rev. B 63, 172411 (2001).

36.  Isotope effects and possible pairing mechanism in optimally doped cuprate superconductors.

G. M. Zhao, V. Kirtikar, & D. E. Morris, Phys. Rev. B (Rapid Communications) 63, 220506 (2001).

37.  Unconventional isotope effects in the high-temperature cuprate superconductors.

G. M.  Zhao, H. Keller, & K. Conder, review article, J. Phys.: Condens. Matter 13, R569 (2001).

38.  Evidence for novel polaronic Fermi-liquid in doped manganites.

A. S. Alexandrov, G. M.  Zhao, H. Keller, B. Lorenz, Y. S. Wang, & C. W. Chu, Phys. Rev. B (Rapid Communications) 64, 140404 (2001).

39.  Raman spectra of polycrystalline La0.67Ca0.33MnO3.

P. X. Zhang, S. J. Huang, H. U. Habermeier, & G. M. Zhao, J. Raman Spectroscopy, 32, 812 (2001).

40.  Raman spectra from isotope substituted La0.67Ca0.33MnO3.

P. X. Zhang, S. J. Huang, H. U. Habermeier, & G. M. Zhao, Physica C, 364, 647 (2001).

 

2000

 

41.  Unusual electrical transport mechanism in the ferromagnetic state of the magnetoresistive manganites

G. M.  Zhao, H. Keller, & W. Prellier,  J. Phys.: Condens. Matter 12, L361 (2000).

42.  Double-exchange and the cause of the ferromagnetism in doped manganites.

G. M. Zhao, Phys. Rev. B 62, 11 639 (2000).

43.  Large oxygen-isotope effect in Sr0.4K0.6BiO3: Evidence for phonon-mediated superconductivity.

G. M.  Zhao, K.Conder, M.Angst, S. M. Kazakov, J. Karpinski, M. Maciejewski, C. Bougerol, J. S. Pshirkov, & E. V. Antipov, Phys. Rev. B (Rapid Communications) 62, R11 977 (2000).

44.  Evidence for the immobile bipolaron formation in the paramagnetic state of the magnetoresistive manganites.

G. M.  Zhao, Y. S. Wang, D. J. Kang, W. Prellier, M. Rajeswari, H. Keller, T. Venkatesan, C. W. Chu, & R. L. Greene, Phys. Rev. B (Rapid Communications) 62, R11 949 (2000).

45.  Electrical transport in the ferromagnetic state of manganites: Small polaron metallic conduction at low temperatures.

G. M. Zhao, V. Smolyaninova, W. Prellier, & H. Keller, Phys. Rev. Lett.  84, 6086 (2000).

46.  EPR in La1-xCaxMnO3+y: Relaxation and bottleneck.

A. Shengelaya, G. M. Zhao, H. Keller, K. A. Muller, & B. I. Kochelaev, Phys. Rev. B 61, 5888 (2000).

47.  Argon annealing of the oxygen-isotope exchanged manganite La0.8Ca0.2MnO3+y.

G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, Phys. Rev. B 62,   5334 (2000).

48.  Oxygen isotope effect on the in-plane penetration depth in underdoped La2-xSrxCuO4 single crystals.

J. Hofer, K. Conder, T. Sasagawa, G. M. Zhao, M. Willemin, H. Keller, & K. Kishio, Phys. Rev. Lett. 84, 4192 (2000).

49.  Oxygen isotope effects in the manganites and cuprates studied by electron paramagnetic resonance.

A. Shengelaya, G. M. Zhao, K. Conder, H. Keller,  & K. A. Muller, Lecture Notes in Physics, New Developments in High Temperature Superconductivity (Springer, 2000) eds. I. Klamut, page 91-99.

50.  Doping dependence of the effective mass anisotropy and oxygen-isotope effect on the magnetic penetration depth: The role of lattice vibrations in high-temperature superconductivity.

J. Hofer, K. Conder, T. Sasagawa, G. M. Zhao, T. Schneider, J.  Karpinski, M. Willemin, H. Keller, & K. Kishio, J. Supercond. 13, 963 (2000).

 

1999

 

51.  Normal-state gap, supercarrier mass anisotropy and isotope effect in La2-xSrxCuO4.

G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, J. Supercond. 12, 41 (1999).

52.  Doping dependence of superconducting parameters in HgBa2CuO4+y.

J. Hofer, J. Karpinski, G. M. Zhao, M. Willemin, G. I. Meijer, E. M. Kopnin, R. Molinski, H. Schwer, C. Rossel, & H. Keller, J. Supercond. 12, 45 (1999).

53.  Very strong magnetic-field dependence of the oxygen isotope shift of the charge-ordering transition in La0.5Ca0.5MnO3.

G. M. Zhao, K. Ghosh, H. Keller, & R. L. Greene, Phys. Rev. B 59, 81 (1999).

54.  Oxygen isotope effects in manganites: Evidence for (bi)polaronic charge carriers

G. M. Zhao, H. Keller, R. L. Greene, & K. A. Muller, Physics of Manganites (Kluwer Academic/Plenum publisher, New York, 1999) eds. T. A. Kaplan & S. D. Mahanti, page 221-241 (invited review article).

55.  Isotope and pressure effects in manganites: Important experimental constraints on the physics of manganites.

G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, Phys. Rev. B 60, 11914 (1999).

56.  Giant oxygen isotope effect on the spin glass transition in La2-xSrxCu1-zMnzO4 as revealed by muon spin rotation.

A. Shengelaya, G. M. Zhao, C. M. Aegerter, K. Conder, I. M. Savic, & H. Keller, Phys. Rev. Lett. 83, 5142 (1999).

57.  Oxygen isotope shift of the charge-stripe ordering temperature in La2-xSrxCuO4 from x-ray absorption spectroscopy.

A. Lanzara, G. M. Zhao, N. L. Saini, A. Bianconi, K. Conder, H. Keller, & K. A. Muller, J. Phys.: Condens. Matter 11, L541 (1999).

 

1998

 

58.  Spontaneous magnetization and antiferromagnetic correlation of CuO2 chains in Sr0.73CuO2.

A. Shengelaya, G. I. Meijer, J. Karpinski, G. M. Zhao, H. Schwer, E. M. Kopnin, C. Rossel, & H. Keller, Phys. Rev. Lett. 80, 3626 (1998).

59.  Oxygen isotope effects in (La0.5Nd0.5)0.67Ca0.33MnO3: Relevance of the electron-phonon interaction to the phase segregation.

M. R. Ibarra, G. M. Zhao, J. M. De Teresa, B. Garcia-Landa, Z. Arnold, C. Marquina, P. A. Algarabel, & H. Keller, Phys. Rev. B 57, 7446 (1998).

60.  Oxygen-isotope effect on the field-induced metal-insulator transition in Pr2/3Ca1/3MnO3.

B. Garcia-Landa, M. R. Ibarra, J. M. De Teresa, G. M. Zhao, & H. Keller, Solid State Commun. 105, 567(1998).

61.  The ratio of small polarons to free carriers in La2-xSrxCuO4 derived from susceptibility measurements.

K. A. Muller, G. M. Zhao, K. Conder, & H. Keller, J. Phys.: Condens. Matter 10, L291 (1998).

62.  Oxygen isotope effects in La2-xSrxCuO4: Evidence for polaronic charge carriers and their condensation.

G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, J. Phys.: Condens. Matter 10, 9055 (1998).

63.  Polaronic and stripe effects in HTSC by x-ray absorption spectroscopy.

A. Lanzara, N. L. Saini, A. Bianconi, G. M. Zhao, & K. A. Muller, Procedings of Second International Conference on

Stripes  and High-Tc Superconductivity (Rome, June 2-6, 1998).

64.  Colossal oxygen isotope shift of the charge-ordering transition in Nd0.5Sr0.5MnO3.

G. M. Zhao, K. Ghosh, & R. L. Greene, J. Phys.: Condens. Matter 10, L737 (1998).

65.  Cause of Tc depression in Sr substituted YBaSrCu3O7-y examined by isotope studies.

G. M. Zhao, A. P. B. Sinha, & D. E. Morris, Physica C 297, 23 (1998).

1997

 

66.  Evidence for polaronic supercarriers in the copper oxide superconductors La2-xSrxCuO4.

G. M. Zhao, M. B. Hunt, H. Keller, & K. A. Muller, Nature 385, 236 (1997).    

67.  Strong oxygen-mass dependence of the thermal-expansion coefficient in the manganites (La1-xCax)1-yMn1-yO3.

G. M. Zhao, M. B. Hunt, & H. Keller, Phys. Rev. Lett. 78, 955 (1997).

68.  Giant oxygen-isotope shift of the ferromagnetic transition temperature in the colossal magnetoresistive La1-xCaxMnO3+y: Evidence for Jahn-Teller polarons.

G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, Phys. Chem. Bd. 201, S. 263 (1997).

69.  Oxygen isotope effects in the manganites and cuprates: Evidence for polaronic charge carriers.

G. M. Zhao, M. B. Hunt, K. Conder, H. Keller, & K. A. Muller, Physica C, 282-287, 202 (1997).

70.  EPR evidence for Jahn-Teller polarons in La1-xCaxMnO3+y.

A. Shengelaya, G. M. Zhao, H. Keller, & K. A. Müller, Physica C 282-287, 190 (1997).

71.  Novel crossover from a metallic to an insulating ground state in (La0.5Nd0.5)0.67Ca0.33MnO3 by increasing oxygen-mass.

G. M. Zhao, H. Keller, J. Hofer, A. Shengelaya, & K. A. Muller, Solid State Commun. 104, 57 (1997).

 

1996

 

72.  Large copper isotope effect in oxygen-depleted YBa2Cu3Oy: Importance of Cu dominated phonon modes in the pairing mechanism.

G. M. Zhao, V. Kirtikar, K. K. Singh, A. P. B. Sinha, & D. E. Morris, Phys. Rev. B 54, 14956 (1996).

73.  Site dependence of large oxygen isotope effect in Y0.7Pr0.3Ba2Cu3O6.97.

G. M. Zhao, J. W. Ager III, & D. E. Morris, Phys. Rev. B 54, 14982 (1996).       

74.  Reply to comment `Observation of possible oxygen isotope effect on the effective mass of carriers in YBa2Cu3O6.04'.

G. M. Zhao & D. E. Morris, Phys. Rev. B 54, 15545 (1996).

75.  Giant oxygen isotope shift in the magnetoresistive perovskite La1-xCaxMnO3+y.

G. M. Zhao, K. Conder, H. Keller, & K. A. Muller, Nature 381, 676 (1996).

76.  EPR evidence of Jahn-Teller polaron formation in La1-xCaxMnO3+y.

A. Shengelaya, G. M. Zhao, H. Keller, & K. A. Muller, Phys. Rev. Lett. 77,  5296 (1996).

 

1995

 

77.  Composition dependence of the oxygen isotope effect in Ba1-xKxBiO3: Evidence for oxygen-mass dependence of the coupling constant.

G. M. Zhao & D. E. Morris, Phys. Rev. B 51, 12848 (1995).

78.  Observation of possible oxygen isotope effect on the effective mass of carriers in YBa2Cu3O6.94.

G. M. Zhao & D. E. Morris, Phys. Rev. B (Rapid communications) 51, 16487 (1995).

79.  Oxygen isotope effect on the effective mass of carriers from magnetic measurements on La2-xSrxCuO4.

G. M. Zhao, K. K. Singh, A. P. B. Sinha, & D. E. Morris, Phys. Rev. B 52, 6840 (1995).

 

1994

                                   

80.  Oxygen isotope effect on Néel temperature in various antiferromagnetic cuprates

G. M. Zhao, K. K. Singh, & D. E. Morris, Phys. Rev. B 50, 4112 (1994).

81.  Sizable oxygen isotope effect in the electron-doped Pr1.85Ce0.15CuO4-y.

G. M. Zhao & D. E. Morris, Phys. Rev. B 50, 3454 (1994).       

 

1988

 

82.  Magnetism and superconductivity in GdBa2Cu3O7-y.

G. M. Zhao, R. L. Wang, & Z. W. Dong, Solid State Commun. 65, 1395 (1988). 

83.  Two-dimension AF ordering or spin-glass freezing at 2.23 K in oxygen-doped GdBa2Cu3O7-y.

C-X. Zhu, G. M. Zhao, & Q. Z. Ran, Solid State Commun. 66, 719 (1988).

84.  Theoretic investigations on composition and pressure dependences of superconductivity for various oxide systems.

G. M. Zhao, R. L. Wang, H. C. Li, Z. W. Dong, & L. Li, Chin. Phys. Lett. 5, 165 (1988).

85.  Some remarkable behaviors below 125 K in high Tc superconductors.

G. M. Zhao, R. L. Wang, H. C. Li, X. R. Cheng, & L. Li, Chin. Phys. Lett. 5, 209 (1988)

86.  Experimental features of antiferromagnetism in GdBa2Cu3O7-y

G. M. Zhao, R. L. Wang, H. C. Li, Q. Z. Ran, C. X. Zhu, L. Li, & W. Y. Guan, Phys. Rev. B 38, 5035 (1988).

87.  A method for preparing superconducting single crystals of GdBa2Cu3O7-y.

R. X. Wan, G. M. Zhao, X. M. Tang, W. Z. Li, S. Z. Hu, & H. N. Yao, J. Appl. Phys. 64, 3754 (1988).

88.  Antiferromagnetism of La2CuO4-y studied by specific heat.

R. Y. Jing, G. M. Zhao, & Q. Z. Ran, Solid State Commun. 67, 415 (1988).

89.  High Tc superconductivity in the BaxY1-xCuO3-y series.

Z. W. Dong, R. L. Wang, H. C. Li, G. M. Zhao, D. Li, Y. Y. Zhao, & L. Li, Chin. Phys. (USA) 8, 1054 (1988).

 

1987

 

90.  Superconductivity mechanism of high Tc oxides.

G. M. Zhao, Z. G. Duan, N. Chao, & H. C. Li, Solid State Commun. 63, 151 (1987).

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