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Title: Correlation Among c/b, Tc, and Madelung Potentials in the System of RBa2Cu3Ox Superconductors
Authors: Tsay, Shiow-Fon;Wang, Shou-Yih;Horng, Lance;Yang, T. J. Watson
Contributors: 物理學系
Date: 1989-11
Issue Date: 2013-02-05T02:16:30Z
Publisher: The American Physical Society
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
Relation: Phys. Rev. B, 40(13): 9408-9411
Appears in Collections:[物理學系] 期刊論文

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