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

Woo Seok Choi, Koji Taniguchi, S. J. Moon, S. S.A. Seo, T. Arima, H. Hoang, I. S. Yang, T. W. Noh, Y. S. Lee

Research output: Contribution to journalArticle

17 Citations (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.

Original languageEnglish
Article number205111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number20
DOIs
Publication statusPublished - 2010 May 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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