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 language | English |
|---|---|
| Pages (from-to) | 9408-9411 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 40 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 1989 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
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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 journal › Article
TY - JOUR
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
PY - 1989/1/1
Y1 - 1989/1/1
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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U2 - 10.1103/PhysRevB.40.9408
DO - 10.1103/PhysRevB.40.9408
M3 - Article
AN - SCOPUS:35949011371
VL - 40
SP - 9408
EP - 9411
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 13
ER -