Effect of magnetic impurities on high-temperature superconductivity in La1.85Sr0.15CuO4
G. W. Crabtree, W. K. Kwok, A. Umezawa, L. Soderholm, L. Morss, E. E. Alp
DOI 10.1103/PhysRevB.36.5258 · Physical Review B
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Abstract
We have investigated the effect of magnetic impurities on the two-dimensional high-Tc superconductor La1.85Sr0.15CuO4 by replacing La with Nd. We find a decrease in Tc and dHc2dT|Tc and an increase in the normal-state resistivity with increasing Nd content. We use the Werthamer, Helfand, and Hohenberg equations to derive the effect of an exchange field, magnetic polarization, nonmagnetic impurity scattering, and changes in the density of states on Tc and dHc2dT|Tc. We find no evidence of an exchange interaction between the magnetic moments and the conduction electrons. We explain the changes in the superconducting properties in terms of the van Hove singularity in the density of states near the Fermi level.
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 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.4 | Pressure not reported | midpoint |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | zero_resistance |
| La1.82Nd0.03Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
| La1.82Nd0.03Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.2 | Pressure not reported | midpoint |
| La1.82Nd0.03Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | zero_resistance |
| La1.45Nd0.4Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| La1.45Nd0.4Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.5 | Pressure not reported | midpoint |
| La1.45Nd0.4Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | zero_resistance |
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