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139La NMR and NQR study of the temperature dependent structure of La2CuO4+δ

  • Author(s): Hammel, PC;
  • Ahrens, ET;
  • Reyes, AP;
  • Heffner, RH;
  • Canfield, PC;
  • Cheong, SW;
  • Fisk, Z;
  • Schirber, JE
  • et al.
Abstract

NMR and NQR reveal substantial structural changes in the metallic phase of La2CuO4+δ which occur below 220 K. The oxygen octahedra in the metallic phase are not tilted at phase separation; upon cooling to 40 K considerable tilt has developed. The low temperature structure is highly disordered. © 1991.

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