Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La 2-xSr xCuO 4: Relation to the microscopic phase separation

Yoichi Tanabe, Tadashi Adachi, Keisuke Omori, Hidetaka Sato, Takashi Noji, Yoji Koike

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24 Citations (Scopus)


In order to investigate the inhomogeneity of the superconducting (SC) state in the overdoped high-T c-cuprates, we have measured the magnetic susceptibility, χ, of La 2-x,Sr xCuO 4 (LSCO) single crystals in the overdoped regime in magnetic fields parallel to the c-axis up to 7 T on warming after zero-field cooling. It has been found for x = 0.198 and 0.219 that the temperature dependence of χ in 1 T shows a plateau, that is, χ is almost independent of temperature in a moderate temperature-range in the SC state. Moreover, a so-called second peak in the magnetization curve has markedly appeared in these crystals. These results indicate an anomalous enhancement of the vortex pinning and strongly suggest the occurrence of a microscopic phase separation into SC and normal-state regions in the overdoped high-T c cuprates.

Original languageEnglish
Article number113706
Journaljournal of the physical society of japan
Issue number11
Publication statusPublished - 2007 Nov 1


  • La Sr CuO
  • Magnetic susceptibility
  • Phase separation
  • Second-peak effect

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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