Larmor diffraction measurement of the temperature dependence of lattice constants in CuGeO3

作者：Martin N; Regnault L P^*; Klimko S; Lorenzo J E; Gaehler R

来源：Physica B: Condensed Matter , 2011, 406(12): 2333-2336.

DOI：10.1016/j.physb.2010.10.006

• Neutron Larmor diffraction
• High-resolution neutron diffraction
• Spin-Peierls transition

By using the neutron Larmor diffraction method and a setup based on the improved neutron resonant spin echo option ZETA recently installed on the three-axis spectrometer IN22 (CRG beam line at the ILL), we have determined the precise relative evolution of the inter- and intra-chain lattice constants of the paradigmatic spin-Peierls compound CuGeO3 as a function of temperature. Our results are consistent with previous results obtained by conventional high-resolution diffraction. This method also allows to retrieve independently the sample mosaicities, as well as the widths of various lattice-spacings distributions, thus offering an evaluation of the intrinsic sample quality. In spite of the good definition of the spin-Peierls transition at T-SP = 14.1(1) K in our sample, we observe a large distribution of lattice constants (Delta d/d similar or equal to 3 x 10(-3)), while the mosaicity of the sample appears to be quite reasonable (less than or similar to 20').

• 出版日期2011-6
• 单位中国地震局