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19 April 2024

» arxiv » cond-mat/9711052

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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
M. N. Popova ; A. B. Sushkov ; A. N. Vasil’ev ; M. Isobe ; Yu. Ueda ;
Date:	6 Nov 1997
Journal:	Pis’ma Zh. Eksp. Teor. Fiz. 65, 711-716 (1997) [JETP Lett. 65, 743-748 (1997)]
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	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.
Source:	arXiv, cond-mat/9711052
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