Case for superconductivity associated primarily with charge-reservoirs rather than cuprate planes

John D. Dow

doi:10.1117/12.271204

15 April 1997 Case for superconductivity associated primarily with charge-reservoirs rather than cuprate planes

John D. Dow

Proceedings Volume 2999, Photodetectors: Materials and Devices II; (1997) https://doi.org/10.1117/12.271204
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Evidence that high-temperature superconductivity originates in the charge-reservoir layers rather than in the cuprate- planes of the host materials is discussed. Hence PrBa₂Cu₃O₇ superconducts when grown under conditions that minimize Ba-site Pr. The supercurrent in high- temperature superconductors is located primarily in the layers where the holes are and the magnetic moments are not. Gd_2-zCe_zCuO₄ fails to superconduct because Gd⁺³ has L equals 0 and does not have its Cooper-pair- breaking limited by crystal-field splitting. The observed charges-transferred in these materials are compatible with charge-reservoir superconductivity, and not with cuprate- plane superconductivity. The observed ionic charge of Ce in Nd_2-zCe_zCuO₄ and its homologues is consistent with p-type superconductivity, doping by the p- type defects pair, and a size effect on the superconductivity. The chemical trends in T_c and the amount of Ni or Zn required to destroy superconductivity by pair-breaking clearly indicate that the primary superconducting condensate is in the charge-reservoir layers.

Citation Download Citation

John D. Dow "Case for superconductivity associated primarily with charge-reservoirs rather than cuprate planes", Proc. SPIE 2999, Photodetectors: Materials and Devices II, (15 April 1997); https://doi.org/10.1117/12.271204

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