Infrared study of spin-Peierls compound alpha'-NaV2O5

Details Infrared study of spin-Peierls compound alpha'-NaV2O5 Infrared study of spin-Peierls compound alpha'-NaV2O5

1998-08-02

arxiv.org/abs/cond-mat/9808006v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 2 figures, 1 table. Contributed paper for the SCES'98 (15-18 July 1998, Paris). To be published in Physica B

Scientific paper

10.1016/S0921-4526(98)00633-4

Infrared reflectance of alpha'-NaV2O5 single crystals in the frequency range from 50 cm-1 to 10000 cm-1 was studied for a, b and c-polarisations. In addition to phonon modes identification, for the a-polarised spectrum a broad continuum absorption in the range of 1D magnetic excitation energies was found. The strong near-IR absorption band at 0.8 eV shows a strong anisotropy with vanishing intensity in c-polarisation. Activation of new phonons due to the lattice dimerisation were detected below 35K as well as pretransitional structural fluctuations up to 65K.

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