Charged Magnons in NaV2O5

Abstract

We investigated the temperature-dependent optical conductivity of NaV2O5 in the energy range 4 meV-4 eV. The intensities and the polarization dependence of the detected electronic excitations give a direct indication for a broken-parity electronic ground-state and for a non-centrosymmetric crystal structure of the system in the high-temperature phase. A direct two-magnon optical absorption process, proposed in this Letter, is in quantitative agreement with the optical data. By analyzing the optically allowed phonons at various temperatures above and below the phase transition, we conclude that a second-order change to a larger unit cell takes place below 34 K.

Revtex, 4 pages, 4 postscript pictures embedded in the text. Due to editing errors the phonon frequencies were mixed up and the title was not the final one. The problems are now solved. Sorry! Final version for Phys. Rev. Lett., in press

References in corpus (2)

• NaV_2O_5 as a quarter-filled ladder compound
• Raman, infrared and optical spectra of the spin-Peierls compound NaV_2O_5

Cited by in corpus (47)

• Electrodynamics of Correlated Electron Materials
• Thermodynamics of Spin S = 1/2 Antiferromagnetic Uniform and Alternating-Exchange Heisenberg Chains
• Magnetic light scattering in low-dimensional quantum spin systems
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
• Charge ordering and opening of spin gap in NaV_2O_5
• Optical investigation of the metal-insulator transition in $FeS{b}_2$
• Coexistence of charge density wave and spin-Peierls orders in quarter-filled quasi-one dimensional correlated electron systems
• Magnon splitting induced by charge ordering in NaV_2O_5
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• Time-resolved optical observation of spin-wave dynamics
• Infrared optical properties of the spin-1/2 quantum magnet $TiOCl$
• Response: Spin-Singlet clusters in the ladder compound NaV2O5
• Charge Order Driven spin-Peierls Transition in NaV2O5
• Giant phonon anomalies in the pseudo-gap phase of TiOCl
• Spin gap behavior and charge ordering in α^{\prime}-NaV_2O_5 probed by light scattering
• 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
• Low temperature ellipsometry of NaV2O5
• High frequency dielectric and magnetic anomaly at the phase transition in NaV2O5
• Electron-phonon and spin-phonon coupling in NaV${}_2$O${}_5$: charge fluctuations effect
• Theoretical study of the optical conductivity of ${\alpha }^{\prime }-Na{V}_2{O}_5$
• Charge Ordering and Spin Dynamics in NaV2O5
• Temperature dependence of optical spectral weights in quarter-filled ladder systems
• Optical properties and electronic structure of Ca-doped alpha'-NaV2O5
• Optical evidence for a magnetically driven structural transition in the spin web $C{u}_{3}Te{O}_6$
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
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• Infrared-active phonon modes in monoclinic multiferroic MnWO4
• First evidence for charge ordering in NaV${}_2$O${}_5$ from Raman spectroscopy
• One-dimensional dynamics of the d-electrons in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5
• Optical properties of NaxV2O5
• Low-energy excitations in NaV2O5
• Charge-ordering and optical transitions of LiV2O5 and NaV2O5
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• Single-particle spectral function of quarter-filled ladder systems
• Infrared study of spin-Peierls compound alpha'-NaV2O5
• Charge ordering in quarter-filled ladder systems coupled to the lattice
• Charge excitations in NaV${}_2$O${}_5$
• The symmetry problem in NaV2O5
• Using electronic structure changes to map the H-T phase diagram of alpha'-NaV2O5
• Electronic Properties of α'-NaV_2O_5
• Coupling of plasmons to the two-magnon continuum in antiferromagnets
• Charge-ordering phase transition and order-disorder effects in the Raman spectra of NaV2O5
• Terahertz light driven coherent excitation of a zone-folded Raman-active phonon mode in the Spin-Ladder System ${\alpha }^{\prime }$-NaV${}_2$O${}_5$