Thermal conductivity of impurity-doped high-Tc superconductors
S. T. Ting, P. Pernambuco-Wise, J. E. Crow
DOI 10.1103/PhysRevB.50.6375 · Physical Review B
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Abstract
The thermal conductivity K(T) of polycrystalline YBa2(Cu1−xMx)3O7 with M=Zn and Al (0≤x≤0.1) and Y1−yRyBa2Cu3O7 with R=Pr and Gd (0≤y≤1.0) has been measured for temperatures 1.2≤T≤200 K. In the pure material, K(T) decreases slightly with decreasing temperature above Tc and below Tc there is a strong enhancement of K(T) reaching a maximum at ∼50 K followed by a sharp decrease. At temperatures below 10 K a T2 dependence is evident similar to behavior reported for amorphous systems with glasslike phonon scattering on the tunneling states. Doping with Zn or Pr rapidly depresses Tc and also depresses the maximum in K(T) even at concentrations that remain superconducting. This effect is observable to a lesser degree for the Al and Gd dopants. Comparisons between the K(T) behavior for impurities that do not depress Tc with those that diversely alter the superconducting properties are presented together with an analysis of the data using the Tewordt-Wölkhausen (TW) theory.
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. | 90 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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