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Electronic structure and anomalous band-edge absorption feature in multiferroic MnWO4: An optical spectroscopic study

Title
Electronic structure and anomalous band-edge absorption feature in multiferroic MnWO4: An optical spectroscopic study
Authors
Choi W.S.Taniguchi K.Moon S.J.Seo S.S.A.Arima T.Hoang H.Yang I.-S.Noh T.W.Lee Y.S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2010
Journal Title
Physical Review B - Condensed Matter and Materials Physics
ISSN
1098-0121JCR Link
Citation
vol. 81, no. 20
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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. © 2010 The American Physical Society.
DOI
10.1103/PhysRevB.81.205111
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자연과학대학 > 물리학전공 > Journal papers
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