Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-04-24
Phys. Rev. B 81, 205111 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Accepted for publication in Physical Review B. 19 pages including 6 figures
Scientific paper
10.1103/PhysRevB.81.205111
We investigated the electronic structure and lattice dynamics of multiferroic MnWO4 by optical spectroscopy. With variation of polarization, temperature, and magnetic field, we obtained optical responses over a wide range of photon energies. The electronic structure of MnWO4 near to the Fermi level was examined, with inter-band 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.
Arima T.
Choi Woo Seok
Hoang H.
Lee Young Sam
Moon Soon Jae
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