Spin-Peierls transition in alpha '-NaV2O5 determined by infrared reflectivity

Article

关键词: MAGNETIC-SUSCEPTIBILITY;    COMPOUND CUGEO3;    SYSTEM CUGEO3;    TEMPERATURE;    CHAINS;    ENERGY;   

DOI  :  10.1103/PhysRevB.57.R11035

来源: SCIE

【 摘 要 】

Polarized infrared reflectivity measurements have been performed on single crystals:of the spin-Peierls compound alpha'-NaV2O5 in the temperature range 20-300 K. Pronounced spectral features associated with the formation of the dimerized phase were detected both in the a and b polarizations (perpendicular and parallel to the spin-1/2 chains, respectively). The temperature dependence of a salient spectral line at 718 cm(-1) sharply rising below the transition temperature T-SP obeys a (1-T/T-SP)(2 beta) law with T(SP)similar or equal to 34.3 K and beta similar or equal to 0.25. In addition, a continuum signal is observed in the whole temperature range in the a-polarized optical conductivity spectra. In order to interpret these results, calculations of the static dimerization and of the optical conductivity based on a mean-held and a dynamical treatment of the lattice respectively are proposed.

【 授权许可】

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