Study of spin-Peierls transition in alpha'--NaV2O5 by infrared reflectivity

Abstract

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)^(2beta) law with T_SP \simeq 34.3$K and beta \simeq 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-field and a dynamical treatment of the lattice respectively are proposed.

4 pages, 5 PostScript figures, Minor changes

References in corpus (5)

• Experimental evidence for a spin-Peierls-transition in ${\alpha }^{\prime }-Na{V}_2{O}_5$
• Dynamical properties of the spin-Peierls compound α'--NaV2O5
• Numerical Study of the Incommensurate Phase in Spin-Peierls Systems
• Dynamical properties of low dimensional CuGeO3 and NaV2O5 systems
• Infrared signatures of the spin-Peierls transition in CuGeO3

Cited by in corpus (14)

• Thermodynamics of Spin S = 1/2 Antiferromagnetic Uniform and Alternating-Exchange Heisenberg Chains
• Coexistence of charge density wave and spin-Peierls orders in quarter-filled quasi-one dimensional correlated electron systems
• Modeling the electronic behavior of $\gamma$-LiV2O5: a microscopic study
• Magnetic bound states in the quarter-filled ladder system ${\alpha }^{\prime }-Na{V}_2{O}_5$}
• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• X-ray Investigation of the Magneto-elastic Instability of alpha'-NaV2O5
• NaV_2O_5 as an Anisotropic t-J Ladder at Quarter Filling
• Spin polarization in the Hubbard model with Rashba spin-orbit coupling on a ladder
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
• Lattice vibrations of alpha'-NaV2O5
• Infrared study of spin-Peierls compound alpha'-NaV2O5
• Electron spins interaction in the spin-Peierls phase of the organic spin chain (o -DMTTF) 2 X (X = Cl, Br, I)
• Using electronic structure changes to map the H-T phase diagram of alpha'-NaV2O5
• The one-dimensional t-J model coupled to adiabatic phonons: A numerical investigation