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Correlations among c/b, Tc, and Madelung potentials in the system of RBa2Cu3Ox superconductors

Shiow-Fon Tsay, Shou-Yih Wang, Lance Horng, and T. J. Watson Yang
Phys. Rev. B 40, 9408(R) – Published 1 November 1989
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Abstract

We have observed a correlation between the lattice-constant ratio c/b and the superconducting transition temperature Tc in R-Be-Cu-O superconductors (where R is a rare-earth element). Madelung potentials and the bond length of Cu(1)-O(3) are calculated and correlated with the distribution of Tc over the various RBa2Cu3O7 superconductors. Further consideration of YBa2Cu3Ox with variable x of suitable oxygen content leads to an explanation of the correlation of decreasing c/b ratio with increasing Tc. A Coulomb-type ionic mechanism is therefore suggested so that shortening of the c axis and increased chain length provides (1) a channel of charge-transfer excitation from chain to Cu-O layers and (2) a long-range Coulomb interaction between the two Cu-O layers, both of which result in stronger coupling between the two Cu-O layers and higher Tc. .AE

  • Received 30 May 1989

DOI:https://doi.org/10.1103/PhysRevB.40.9408

©1989 American Physical Society

Authors & Affiliations

Shiow-Fon Tsay and Shou-Yih Wang

  • Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300 42, Republic of China

Lance Horng and T. J. Watson Yang

  • Electrophysics Department, National Chiao-Tung University, Hsinchu, Taiwan 300 42, Republic of China

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Issue

Vol. 40, Iss. 13 — 1 November 1989

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