Incommensurate lattice distortion in the high temperature tetragonal phase of La2-x(Sr,Ba)xCuO4

Shuichi Wakimoto, Hiroyuki Kimura, Masaki Fujita, Kazuyoshi Yamada, Yukio Noda, Gen Shirane, Genda Gu, Hyunkyung Kim, Robert J. Birgeneau

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22 Citations (Scopus)


We report incommensurate diffuse (ICD) scattering appearing in the high-temperature-tetragonal (HTT) phase of La2-x(Sr,Ba) xCuO4 with 0.07 ≤ x ≤ 0.20 observed by the neutron diffraction technique. For all compositions, a sharp superlattice peak of the low-temperature-orthorhombic (LTO) structure is replaced by a pair of ICD peaks with the modulation vector parallel to the CuO6 octahedral tilting direction, that is, the diagonal Cu-Cu direction of the CuO2 plane, above the LTO-HTT transition temperature Ts. The temperature dependences of the incommensurability δ for all samples scale approximately as T/Ts, while those of the integrated intensity of the ICD peaks scale as (T - Ts)-1. These observations together with absence of ICD peaks in the non-superconducting x = 0.05 sample evince a universal incommensurate lattice instability of hole-doped 214 cuprates in the superconducting regime.

Original languageEnglish
Article number074714
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - 2006 Jul


  • Diffuse scattering
  • High-T superconductivity
  • LaSrCuO
  • Neutron scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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