期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 75, 期 7, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.75.074714
关键词
La2-xSrxCuO4; high-T-c superconductivity; neutron scattering; diffuse scattering
We report incommensurate diffuse (ICD) scattering appearing in the high-temperature-tetragonal (HTT) phase of La2-x(Sr,Ba)(x)CuO4 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 T-s. The temperature dependences of the incommensurability 6 for all samples scale approximately as T/T-s, while those of the integrated intensity of the ICD peaks scale as (T - T-s)(-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.
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