Spin gap in the normal state of Pr-doped and oxygen-deficient RBa2Cu3O7 superconductors
S. J. Liu, Weiyan Guan
DOI 10.1103/PhysRevB.58.11716 · Physical Review B
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Abstract
The spin-gap temperatures (TS) in the normal state of bulk Pr-doped RBa2Cu3O7 (R1−xPrxBa2Cu3O7) and oxygen-deficient RBa2Cu3Ox (R=Yb, Er, Y, Ho, Dy, Gd, Eu, Sm, and Nd) are investigated. The elements on the R sites and the distance between CuO2 planes are found to have no influence on TS in oxygen-deficient RBa2Cu3Ox in terms of the relationship between the superconducting temperature (TC) and TS. However, for R1−xPrxBa2Cu3O7, TS increases with increasing ionic size of R-site elements for a fixed Pr concentration. Furthermore, by comparing TS of oxygen-deficient RBa2Cu3Ox to that of R1−xPrxBa2Cu3O7 at the same TC, it is observed that Pr atoms doped on the R sites not only reduce the carrier density and induce the spin gap, but will also simultaneously suppress TS.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Y1-xPrxBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | midpoint |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | midpoint |
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