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

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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.

Original languageEnglish
Article number220509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number22
DOIs
Publication statusPublished - 2011 Jun 21

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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