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

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.

RevTex, 4 pages, 3 figures

Cited by in corpus (11)

• Electrodynamics of Correlated Electron Materials
• Extensive infrared spectroscopic study of CuO: signatures of strong spin-phonon interaction and structural distortion
• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• High frequency dielectric and magnetic anomaly at the phase transition in NaV2O5
• Lattice dynamics and a magnetic-structural phase transition in the nickel orthoborate $N{i}_3(B{O}_3{)}_2$
• Folded modes in the infrared spectra of the spin-Peierls phase of CuGeO_3
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
• Lattice vibrations of alpha'-NaV2O5
• Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
• Charge ordering in quarter-filled ladder systems coupled to the lattice
• Lattice dynamics and electronic transitions in a structurally-complex layered copper borate Cu${}_3$(BO${}_3$)${}_2$