Magneto-Dielectric Effect in the S = 1/2 Quasi-Two Dimensional Antiferromagnet K2V3O8

Abstract

We report the optical and magneto-optical properties of K2V3O8, an S=1/2 quasi-two-dimensional Heisenberg antiferromagnet. Local spin density approximation electronic structure calculations are used to assign the observed excitations and analyze the field dependent features. Two large magneto-optical effects, centered at ~1.19 and 2.5 eV, are attributed to field-induced changes in the V 4+ d to d on-site excitations due to modification of the local crystal field environment of the VO5 square pyramids with applied magnetic field. Taken together, the evidence for a soft lattice, the presence of vibrational fine structure on the sharp 1.19 eV magneto-optical feature,and the fact that these optical excitations are due to transitions from a nearly pure spin polarized V d state to hybridized states involving both V and O, suggest that the magneto-dielectric effect in K2V3O8 is driven by strong lattice coupling.

arXiv commentZipped file containing 8 pages, 12 figures, in press PRB

References in corpus (14)

• Spintronics: Fundamentals and applications
• Magnetodielectric Effects from Spin Fluctuations in Isostructural Ferromagnetic and Antiferromagnetic Systems
• A Field-Induced Re-Entrant Novel Phase and A Ferroelectric-Magnetic Order Coupling in HoMnO3
• Strong spin-lattice coupling in multiferroic HoMnO${}_3$: Thermal expansion anomalies and pressure effect
• Electric Field Effect in Diluted Magnetic Insulator Anatase Co:TiO2
• Weak ferromagnetism and field-induced spin reorientation in K2V3O8
• Structural, electronic, and magneto-optical properties of YVO${}_3$
• Specific heat investigation of the magnetic ordering in two frustrated spin-chain oxides: Ca3Co2O6 and Ca3CoRhO6
• Raman Scattering from Magnetic Excitations in the Spin Ladder Compounds CaV2O5 and MgV2O5
• Effects of an external magnetic field on the gaps and quantum corrections in an ordered Heisenberg antiferromagnet with Dzyaloshinskii-Moriya anisotropy
• Optical properties and electronic structure of Ca-doped alpha'-NaV2O5
• Infrared and Raman spectra of LiV2O5 single crystals
• Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
• Optical properties of NaxV2O5

Cited by in corpus (7)

• Electronic structure and bond competition in the polar magnet PbVO${}_3$
• Observation of field-dependent magnetic parameters in the magnetic molecule {Ni4Mo12}
• Detection of coherent magnons via ultrafast pump-probe reflectance spectroscopy in multiferroic Ba0.6Sr1.4Zn2Fe12O22
• Magnetic Excitation Spectrum of the Square Lattice S=1/2 Heisenberg Antiferromagnet K2V3O8
• Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Coupling of spin and lattice modes in the S=1/2 two-dimensional antiferromagnet K${}_2$V${}_3$O${}_8$ with magneto-dielectric couplings
• 51V-NMR study on the S=1/2 square lattice antiferromagnet K2V3O8