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Jpn. J. Appl. Phys. 27 (1988) pp. L1422-L1424  |Next Article|  |Table of Contents|
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Letter

On the Superconductivity of the Bi/Tl Materials and the Implications for YBa₂Cu₃O_7-δ near δ=0.5

G. J. Hyland

Department of Physics, University of Warwick

(Received May 2, 1988; accepted for publication July 22, 1988)

Formal valence considerations strongly suggest that the high-T_c superconductivity in the newly discovered class of materials containing either Bi or Tl involves a metallic d-band based on Cu²⁺ ions-quite unlike the situation in YBa₂Cu₃O_7-δ where, near δ=0, the carriers are holes in the oxygen band. It is argued that this difference is (a) the principal reason for the greatly enhanced environmental stability of the new materials, and (b) potentially relevant to an understanding of the non-zero T_c (≃45 K) now reported for YBa₂Cu₃O_7-δ, near δ=0.5, and of the associated plateau in T_c (≃60 K) observed for 0.4<δ<0.3; various experimental checks on these ideas are suggested.

URL: http://jjap.jsap.jp/link?JJAP/27/L1422/
DOI: 10.1143/JJAP.27.L1422
KEYWORDS:bismuth, thallium, high-T_{c$, YBa$2$Cu$3$O$6.5+η$, metallic Cu-conduction versus oxygen holes}

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