Possible phase separation in the overdoped regime of La2-xSrxCuO4

T. Adachi, Y. Tanabe, T. Noji, H. Sato, Y. Koike

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11 Citations (Scopus)

Abstract

In order to investigate the possible inhomogeneous superconductivity in the overdoped high-Tc cuprates, suggested from the muon-spin-relaxation measurements, we have grown a single crystal of La2-xSrxCuO4 in which the Sr concentration, x, continuously changes in the overdoped regime and measured the magnetic susceptibility of several pieces of single crystals with different x values by slicing the single crystal. It has been found that the Meissner volume fraction, regarded as corresponding to the superconducting (SC) volume fraction in a sample, as well as Tc rapidly decreases with increasing x. It has been concluded that a phase separation into SC and normal-state regions takes place in a sample of La2-xSrxCuO4 in the overdoped regime. The separated two phases in the overdoped regime may be a hole-rich normal Fermi-liquid state region and a hole-poor superconducting one. Otherwise, holes doped into the Cu 3d orbital may destroy the superconductivity around themselves, producing normal-state regions in the superconducting sea.

Original languageEnglish
Pages (from-to)14-16
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume445-448
Issue number1-2
DOIs
Publication statusPublished - 2006 Oct 1

Keywords

  • LaSrCuO
  • Magnetic susceptibility
  • Phase separation
  • Sr-concentration-gradient single crystal
  • Superconducting volume fraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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