Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-07-15
Phys. Rev. B 78, 054440 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages including 4 figures
Scientific paper
10.1103/PhysRevB.78.054440
We investigated the effects of temperature and magnetic field on the electronic structure of hexagonal RMnO3 (R = Gd, Tb, Dy, and Ho) thin films using optical spectroscopy. As the magnetic ordering of the system was disturbed, a systematic change in the electronic structure was commonly identified in this series. The optical absorption peak near 1.7 eV showed an unexpectedly large shift of more than 150 meV from 300 K to 15 K, accompanied by an anomaly of the shift at the Neel temperature. The magnetic field dependent measurement clearly revealed a sizable shift of the corresponding peak when a high magnetic field was applied. Our findings indicated strong coupling between the magnetic ordering and the electronic structure in the multiferroic hexagonal RMnO3 compounds.
Choi Woo Seok
Lee Daesu
Lee Jung Hyuk
Lee Yun Sang
Moon Soon Jae
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