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J. Phys. Soc. Jpn. 75 (2006) 074714 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Incommensurate Lattice Distortion in the High Temperature Tetragonal Phase of La2-x(Sr,Ba)xCuO4

Shuichi Wakimoto, Hiroyuki Kimura1, Masaki Fujita2, Kazuyoshi Yamada2, Yukio Noda1, Gen Shirane3, Genda Gu3, Hyunkyung Kim4 and Robert J. Birgeneau5

Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577
2Institute for Material Research, Tohoku University, Katahira, Sendai 980-8577
3Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000, U.S.A.
4Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7
5Department of Physics, University of California, Berkeley, Berkeley, CA 94720-7300, U.S.A.

(Received March 23, 2006; Accepted May 12, 2006; Published July 10, 2006)

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. ©2006 The Physical Society of Japan

KEYWORDS: La2-xSrxCuO4, high-Tc superconductivity, neutron scattering, diffuse scattering
URL: http://jpsj.ipap.jp/link?JPSJ/75/074714/
DOI: 10.1143/JPSJ.75.074714


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