Constraints imposed by the data on a successful theory of high-temperature superconductivity

Howard A. Blackstead; John D. Dow

doi:10.1117/12.206908

24 April 1995 Constraints imposed by the data on a successful theory of high-temperature superconductivity

Howard A. Blackstead, John D. Dow

Proceedings Volume 2397, Optoelectronic Integrated Circuit Materials, Physics, and Devices; (1995) https://doi.org/10.1117/12.206908
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

Data for high-temperature superconductivity are analyzed in order to determine the required nature of a successful general theory of oxide superconductivity. (1) The p-type nature of high-temperature superconductivity requires a model based on oxygen. (2) Since ideal (Rare- earth) Ba₂Cu₃O₇ compounds superconduct at approximately equals 92 K even for magnetic rare-earth ions, but the same compounds do not superconduct when many of the same magnetic ions occupy Ba-sites, the superconductivity must originate in the charge-reservoir region, not in the cuprate planes. (3) The recent observation of photo-induced superconductivity in YBa₂Cu₃O_x, but not in La₂CuO₄, indicates the importance of charge-balance and whether the dopant oxygen is interstitial or substitutional. (4) Pair-breaking data require that a successful model be three-dimensional. (5) The observation of granular superconductivity in PrBa₂Cu₃O₇ requires a successful model to be inhomogeneous. (6) Many data require that the superconductivity originate in charge-reservoirs, rather than in cuprate planes. The following classes of models are ruled out: (1) Cu⁺²↔Cu⁺³ valence fluctuations models; (2) spin-fluctuation and d-wave pairing models; (3) hybridization and t-J models of the insulating nature of PrBa₂Cu₃O₇; (4) all models based on the charge-transfer hypothesis; (5) all two- dimensional models; and (6) all homogeneous models.

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Howard A. Blackstead and John D. Dow "Constraints imposed by the data on a successful theory of high-temperature superconductivity", Proc. SPIE 2397, Optoelectronic Integrated Circuit Materials, Physics, and Devices, (24 April 1995); https://doi.org/10.1117/12.206908

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