Appearance of new lines and change in line shape in the IR spectrum of a NaV_2O_5 single crystal at the spin-Peierls transition

Details Appearance of new lines and change in line shape in the IR spectrum of a NaV_2O_5 single crystal at the spin-Peierls transition Appearance of new lines and change in line shape in the IR spectrum of a NaV_2O_5 single crystal at the spin-Peierls transition

1997-11-06

arxiv.org/abs/cond-mat/9711052v1

Pis'ma Zh. Eksp. Teor. Fiz. 65, 711-716 (1997) [JETP Lett. 65, 743-748 (1997)]

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex, 4 pages, 3 figures

Scientific paper

10.1134/1.567420

We report the first observation of new lines in the infrared spectrum of a crystal due to unit-cell doubling at the spin-Peierls transition (in NaV_2O_5). The change in the shape of the spectral lines at the spin-Peierls transition is recorded for the first time. A contour characteristic of a Fano resonance is observed above the transition temperature Tsp and the standard symmetric contour is observed below Tsp. We attribute this effect to the opening of a gap in the magnetic-excitation spectrum at the spin-Peierls transition.

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