Abstract
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.
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Pickett, W.E., Krakauer, H., Cohen, R.E., Singh, D., Papaconstantopoulos, D.A. (1990). Correlation in Metallic Copper Oxide Superconductors: How Large is it?. In: Kwok, H.S., Kao, YH., Shaw, D.T. (eds) Superconductivity and Applications. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-7565-4_43
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