Independent control of low-energy resonant states and polaron states by the Zn-doping and the structural transition in La 2-xSr xCuO 4 and La 2-xBa xCuO 4 (x=0.11)

S. Sugai, T. Adachi, K. Sugiura, T. Takahashi, K. Obara, Y. Takayanagi, Yoji Koike

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Abstract

The superconductivity depression mechanisms at x≈1/8 in La 2-x Ba x CuO 4 and Zn substitution in La 2-x Sr x CuO 4 were investigated by Raman scattering. About 80% of low-energy electronic states are two-dimensional at x≈1/8 and form the Fermi arc around (π/2,π/2). The low-energy states are composed of the resonant peak relating to the insulator-metal transition and the polaron states of the B 3u phonons. Zn substitution depresses the resonant peak, while the LTT structure depresses the polaron states. The superconductivity is suppressed if one of them is reduced.

Original languageEnglish
Pages (from-to)313-317
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume22
Issue number3
DOIs
Publication statusPublished - 2009 Apr 1

Keywords

  • 1/8 anomaly
  • LBCO
  • LSCO
  • Polaron
  • Raman scattering
  • Resonant peak
  • Zn substitution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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