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Jpn. J. Appl. Phys. 26 (1987) pp. L460-L462  |Next Article|  |Table of Contents|
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Letter

Electronic Structures and Superconducting Mechanism of Ba2Y1Cu3O7

Hideo Ihara, Masayuki Hirabayashi, Norio Terada, Yoichi Kimura, Kiyoshi Senzaki, Makio Akimoto, Kenichi Bushida, Fumiyuki Kawashima and Ryuichi Uzuka

Electrotechnical Laboratory

(Received March 16, 1987; accepted for publication March 23, 1987)

The high-Tc superconductor Ba2Y1Cu3O7 with the oxygen-deficient perovskite structure was prepared almost in a single-phase with Tco of 125 K, Tc of 95 and Tce of 93 K. The XPS valence-band spectrum showed a relative large N(EF), density of states at the Fermi level. The XPS Cu 2p3/2 peak is divided into three peaks which are attributed to monovalent, bivalent and trivalent Cu ions with the concentration ratio of 1:2:1. These results and the peculiar lattice structure lead to the Tc enhancement mechanism from the plasmon or exciton origin due to the Cu d-hole creation and annihilation resonating with vibration modes of the CuO5 and CuO4 clusters. The Tc value was calculated.

URL: http://jjap.jsap.jp/link?JJAP/26/L460/
DOI: 10.1143/JJAP.26.L460


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