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Title: Magnetodielectric Effect in the S = 1/2 Quasi-Two-Dimensional Antiferromagnet K 2V 3O 8

Abstract

We report the optical and magneto-optical properties of K{sub 2}V{sub 3}O{sub 8}, 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 {approx}1.19 and 2.5 eV, are attributed to field-induced changes in the V{sup 4+} d {yields} d on-site excitations due to modification of the local crystal field environment of the VO{sub 5} 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 K{sub 2}V{sub 3}O{sub 8} is driven by strong lattice coupling.

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [2];  [2];  [2]
  1. University of Tennessee, Knoxville (UTK)
  2. ORNL
  3. Florida State University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1003266
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 73; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; CRYSTAL FIELD; D STATES; ELECTRONIC STRUCTURE; FINE STRUCTURE; MAGNETIC FIELDS; MAGNETO-OPTICAL EFFECTS; MODIFICATIONS; SPIN

Citation Formats

Rai, R. C., Cao, J., Musfeldt, J. L., Singh, David J, Wei, X., Jin, Rongying, Zhou, Zhixian, Sales, Brian C, and Mandrus, David. Magnetodielectric Effect in the S = 1/2 Quasi-Two-Dimensional Antiferromagnet K2V3O8. United States: N. p., 2006. Web. doi:10.1103/PhysRevB.73.075112.
Rai, R. C., Cao, J., Musfeldt, J. L., Singh, David J, Wei, X., Jin, Rongying, Zhou, Zhixian, Sales, Brian C, & Mandrus, David. Magnetodielectric Effect in the S = 1/2 Quasi-Two-Dimensional Antiferromagnet K2V3O8. United States. doi:10.1103/PhysRevB.73.075112.
Rai, R. C., Cao, J., Musfeldt, J. L., Singh, David J, Wei, X., Jin, Rongying, Zhou, Zhixian, Sales, Brian C, and Mandrus, David. Sun . "Magnetodielectric Effect in the S = 1/2 Quasi-Two-Dimensional Antiferromagnet K2V3O8". United States. doi:10.1103/PhysRevB.73.075112.
@article{osti_1003266,
title = {Magnetodielectric Effect in the S = 1/2 Quasi-Two-Dimensional Antiferromagnet K2V3O8},
author = {Rai, R. C. and Cao, J. and Musfeldt, J. L. and Singh, David J and Wei, X. and Jin, Rongying and Zhou, Zhixian and Sales, Brian C and Mandrus, David},
abstractNote = {We report the optical and magneto-optical properties of K{sub 2}V{sub 3}O{sub 8}, 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 {approx}1.19 and 2.5 eV, are attributed to field-induced changes in the V{sup 4+} d {yields} d on-site excitations due to modification of the local crystal field environment of the VO{sub 5} 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 K{sub 2}V{sub 3}O{sub 8} is driven by strong lattice coupling.},
doi = {10.1103/PhysRevB.73.075112},
journal = {Physical Review B},
number = 7,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}