Enhanced superconducting Tc in the immiscible system (La1.85Sr0.15CuO4)x(Lu2Cu2O5)1−x
S. Park, C. L. Zhang, N. Lee, Y. J. Choi, S. Guha, S.-W. Cheong
DOI 10.1103/PhysRevB.83.220509 · Physical Review B
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Abstract
We discovered that the immiscibility between La1.85Sr0.15CuO4 and Lu2Cu2O5 leads to a micrometer-scale heterogeneous mixture of a superconducting cuprate and an antiferromagnetic insulator. Whereas electronic conduction of the mixture in the normal state exhibits a percolation behavior, superconducting Tc systematically increases with increasing amounts of insulating Lu2Cu2O5. The highest onset Tc of 46 K is achieved near the percolation threshold. Even though an unusual magnetic proximity effect cannot be ruled out, a plausible cause for the Tc enhancement is the tensile strain in highly anisotropic La1.85Sr0.15CuO4 induced by the differential thermal contraction of the two phases.
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. | 38.5 | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | onset |
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