Correlation in Metallic Copper Oxide Superconductors: How Large is it?
The remarkably high superconducting transition temperatures (Tc) of the copper oxide superconductors suggest some unusual property is necessary to account for high Tc. Suggestions for such a characteristic property include (1) the layered, highly two-dimensional (2D) structure itself, (2) the proximity to metal/insulator, magnetic/nonmagnetic or structural transitions, (3) large anharmonicity, and (4) very large electron-phonon coupling, among others. However, the increasing number of distinct compounds1 which display Tc values ranging quasicontinuously from low temperature to above 100 K can be interpreted as indicating there is some property (related to pairing, of course) which is a rather general property of layered cuprates and which is variable. Moreover, the question of whether the layered cuprates are special is raised by the bismuthates, since (Ba,K)BiO3 (containing no Cu) superconducts above2 30 K.
KeywordsFermi Surface Metallic Phase Electron Energy Loss Spectroscopy Coherent Potential Approximation Local Spin Density Approximation
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- 3.W. E. Pickett, Comments on Solid State Phys. 12, 1 (1985); ibid. 59 (1986), and references therein.Google Scholar
- 5.J. Fink, N. Wicker, H. Romberg, and J. C. Fuggle, IBM J. Res. Devel. (1989, in press).Google Scholar
- 7.J. Redinger, A. J. Freeman, J. Yu, and S. Massidda, Phys. Lett. Al24, 469 (1987).Google Scholar
- 11.R. Manzke, T. Buslaps, R. Claessen, M. Skibowski, and J. Fink, preprint; J. Fink, Proc. Intl. Winter School on Elect. Props. of Polymers and Related Compounds, Kirchberg, Austria, 1989 (in press).Google Scholar
- 13.P. A. Lee, T. M. Rice, J. W. Serene, L. J. Sham, and J. W. Wilkins, Comments on Cond. Matt. Phys. 12, 99 (1986);Google Scholar
- W. E. Pickett, in Novel Superconductivity, S. A. Wolf and V. Z. Kresin ( Plenum, New York, 1987 ), 233.Google Scholar
- C. G. Olson, Proc. Intl. Conf. on Materials and Mechanisms of Superconductivity, Stanford, 1989.Google Scholar
- 15.J.-M. Imer, Phys. Rev. Lett. 62 336 (1989); see also Refs. 6, 11, and 14.Google Scholar
- 18.D. A. Papaconstantopoulos, A. Pasturel, J. P. Julien, and F. CyrotLackmann, Phys. Rev. B40, (1989) in press.Google Scholar
- 20.L. Pinchovius, N. Pyka, W. Reichardt, A. Yu. Rumiantsev, A. Ivanov, and N. Mitrofanov, in Proc. Intl. Symp. on High Tc Superconductivity, Dubna, July 1989 (in press).Google Scholar
- 24.K. Kitazawa, invited paper at the Spring MRS Mtg., San Diego, 1989.Google Scholar
- 25.D. Singh, W. E. Pickett, R. E. Cohen, D. A. Papaconstantopoulos, and H. Krakauer, Physica B (1989, in press).Google Scholar
- 27.A. J. Freeman, J. Yu, S. Massidda, and D. D. Koelling, Physica 148B, 212 (1987).Google Scholar
- 29.W. E. Pickett and D. A. Papaconstantopoulos, in Atomic Scale Calculations in Materials Science, J. Tersoff, D. Vanderbilt, and V. Vitek, MRS Symp. Proc. No. 141 ( MRS, Pittsburgh, 1989 ), 109.Google Scholar
- 31.J. Friedel, preprint.Google Scholar