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

Shiow Fon Tsay, Shou Yih Wang, Lance Horng, T. J.Watson Yang

Research output: Contribution to journalArticle

10 Citations (Scopus)

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

Original languageEnglish
Pages (from-to)9408-9411
Number of pages4
JournalPhysical Review B
Volume40
Issue number13
DOIs
Publication statusPublished - 1989 Jan 1

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Superconducting materials
Bond length
Coulomb interactions
Rare earth elements
Chain length
Superconducting transition temperature
Lattice constants
Charge transfer
Oxygen
rare earth elements
transition temperature
charge transfer
oxygen
excitation
interactions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Tsay, Shiow Fon ; Wang, Shou Yih ; Horng, Lance ; Yang, T. J.Watson. / Correlations among c/b, Tc, and Madelung potentials in the system of RBa2Cu3Ox superconductors. In: Physical Review B. 1989 ; Vol. 40, No. 13. pp. 9408-9411.
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Correlations among c/b, Tc, and Madelung potentials in the system of RBa2Cu3Ox superconductors. / Tsay, Shiow Fon; Wang, Shou Yih; Horng, Lance; Yang, T. J.Watson.

In: Physical Review B, Vol. 40, No. 13, 01.01.1989, p. 9408-9411.

Research output: Contribution to journalArticle

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T1 - Correlations among c/b, Tc, and Madelung potentials in the system of RBa2Cu3Ox superconductors

AU - Tsay, Shiow Fon

AU - Wang, Shou Yih

AU - Horng, Lance

AU - Yang, T. J.Watson

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N2 - 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

AB - 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

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