Thermal-conductivity study on the electronic state in the overdoped regime of La2-xSrxCuO4: Phase separation and anomaly at x ∼ 0.21

T. Adachi, S. M. Haidar, Takayuki Kawamata, N. Sugawara, N. Kaneko, M. Uesaka, H. Sato, Yoichi Tanabe, Takashi Noji, K. Kudo, N. Kobayashi, Yoji Koike

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Abstract

Measurements of the in-plane thermal conductivity, κa b, in magnetic fields parallel to the c-axis have been carried out in the overdoped regime of La2-xSrxCuO4 with x = 0.18 - 0.30. At low temperatures, κa b is enhanced by the application of magnetic field for x < 0.22 due to the Volovik effect, while κ a b is suppressed for x > 0.22. No Volovik effect for x > 0.22 is explained as being due to the phase separation into superconducting and normal-state regions. Moreover, the enhancement of κa b has been found to be singularly weak at x ∼ 0.21 where Tc is a little suppressed in zero field. A so-called stripe order might be stabilized by the application of magnetic field at x ∼ 0.21, as in the case of x ∼ 0.115.

Original languageEnglish
Article number052115
JournalJournal of Physics: Conference Series
Volume150
Issue number5
DOIs
Publication statusPublished - 2009 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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