Enhanced superconducting Tc in the immiscible system (La 1.85Sr0.15CuO4)x(Lu 2Cu2O5)1-x

S. Park; C. L. Zhang; N. Lee; Y. J. Choi; S. Guha; S. W. Cheong

doi:10.1103/PhysRevB.83.220509

Enhanced superconducting T_c in the immiscible system (La _1.85Sr_0.15CuO₄)_x(Lu ₂Cu₂O₅)_1-x

S. Park, C. L. Zhang, N. Lee, Y. J. Choi, S. Guha, S. W. Cheong

Department of Physics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We discovered that the immiscibility between La_1.85Sr _0.15CuO₄ 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 T _c systematically increases with increasing amounts of insulating Lu₂Cu₂O₅. The highest onset T_c 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 T_c enhancement is the tensile strain in highly anisotropic La_1.85Sr _0.15CuO₄ induced by the differential thermal contraction of the two phases.

Original language	English
Article number	220509
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.83.220509
Publication status	Published - 2011 Jun 21

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We discovered that the immiscibility between La1.85Sr 0.15CuO4 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 T c 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 La1.85Sr 0.15CuO4 induced by the differential thermal contraction of the two phases.",

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AU - Park, S.

AU - Zhang, C. L.

AU - Lee, N.

AU - Choi, Y. J.

AU - Guha, S.

AU - Cheong, S. W.

PY - 2011/6/21

Y1 - 2011/6/21

N2 - We discovered that the immiscibility between La1.85Sr 0.15CuO4 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 T c 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 La1.85Sr 0.15CuO4 induced by the differential thermal contraction of the two phases.

AB - We discovered that the immiscibility between La1.85Sr 0.15CuO4 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 T c 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 La1.85Sr 0.15CuO4 induced by the differential thermal contraction of the two phases.

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Enhanced superconducting T_c in the immiscible system (La _1.85Sr_0.15CuO₄)_x(Lu ₂Cu₂O₅)_1-x

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