TY - JOUR
T1 - Electronic structure and anomalous band-edge absorption feature in multiferroic MnWO4
T2 - An optical spectroscopic study
AU - Choi, Woo Seok
AU - Taniguchi, K.
AU - Moon, S. J.
AU - Seo, S. S.A.
AU - Arima, T.
AU - Hoang, H.
AU - Yang, I. S.
AU - Noh, T. W.
AU - Lee, Y. S.
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/5/13
Y1 - 2010/5/13
N2 - We investigated the electronic structure and lattice dynamics of multiferroic MnWO4 by optical spectroscopy. With variation in polarization, temperature, and magnetic field, we obtained optical responses over a wide range of photon energies. The electronic structure of MnWO 4 near to the Fermi level was examined with interband transitions identified in optical conductivity spectra above a band gap of 2.5 eV. As for the lattice dynamics, we identified all the infrared transverse optical-phonon modes available according to the group-theory analysis. Although we did not observe much change in global electronic structure across the phase-transition temperatures, an optical absorption at around 2.2 eV showed an evident change depending upon the spin configuration and magnetic field. The behavior of this band-edge absorption indicates that spin-orbit coupling plays an important role in multiferroic MnWO4.
AB - We investigated the electronic structure and lattice dynamics of multiferroic MnWO4 by optical spectroscopy. With variation in polarization, temperature, and magnetic field, we obtained optical responses over a wide range of photon energies. The electronic structure of MnWO 4 near to the Fermi level was examined with interband transitions identified in optical conductivity spectra above a band gap of 2.5 eV. As for the lattice dynamics, we identified all the infrared transverse optical-phonon modes available according to the group-theory analysis. Although we did not observe much change in global electronic structure across the phase-transition temperatures, an optical absorption at around 2.2 eV showed an evident change depending upon the spin configuration and magnetic field. The behavior of this band-edge absorption indicates that spin-orbit coupling plays an important role in multiferroic MnWO4.
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U2 - 10.1103/PhysRevB.81.205111
DO - 10.1103/PhysRevB.81.205111
M3 - Article
AN - SCOPUS:77955750391
SN - 1098-0121
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 20
M1 - 205111
ER -