Correlation between superconductivity and normal-state properties in the La1.85Sr0.15(Cu1−xZnx)O4 system
Gang Xiao, A. Bakhshai, Marta Z. Cieplak, Z. Tesanovic, C. L. Chien
DOI 10.1103/PhysRevB.39.315 · Physical Review B
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Abstract
Superconducting and normal-state properties have been studied in the La1.85Sr0.15(Cu1−xZnx)O4 system with 0≤x≤0.06. The value of Tc decreases rapidly with the Zn content and vanishes as 2.1 at.% of Zn is doped into the Cu sublattice. Metallic resistivity is observed when superconductivity disappears at x=0.02. The suppression of Tc is not caused by the reduction of carrier concentration which should remain constant in the Zn-doped samples, but rather due to the filling of the local Cu dx2−y2 state. The residual resistivity scales linearly with the Zn content as expected from the impurity scattering due to disorder. Quantitative analysis of the residual resistivity indicates that the mean free path due to disorder is about twice as large as the coherence length when Tc is suppressed to zero. The implication of this finding on the disorder pair-breaking effect will be discussed. The value of Tc is found to strongly correlate with the slope of the resistivity in relation to temperature. Qualitative analysis is carried out in both inelastic and elastic scattering process between carriers and other excitations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.8 | Pressure not reported | midpoint |
| La1.85Sr0.15(Cu0.995Zn0.005)O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.1 | Pressure not reported | midpoint |
| La1.85Sr0.15(Cu0.99Zn0.01)O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.1 | Pressure not reported | midpoint |
| La1.85Sr0.15(Cu0.985Zn0.015)O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.1 | Pressure not reported | midpoint |
| La1.85Sr0.15(Cu0.98Zn0.02)O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | Pressure not reported | midpoint |
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