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Optical Study of MnO under High Pressure
Author(s) -
Mita Y.,
Sakai Y.,
Izaki D.,
Kobayashi M.,
Endo S.,
Mochizuki S.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200101)223:1<247::aid-pssb247>3.0.co;2-r
Subject(s) - raman spectroscopy , raman scattering , antiferromagnetism , diffraction , condensed matter physics , phase transition , magnon , materials science , chemistry , optics , ferromagnetism , physics
Raman and optical absorption studies of the antiferromagnetic insulator MnO were performed at several temperatures under high pressure. In Raman scattering at 2 K, it was observed that the two‐magnon peak shifts to higher energy with increasing pressure and then disappears at around 20 GPa. This suggests that a change in spin arrangement occurs at that pressure. At 77 K the peak‐vanishing pressure increases to 25 GPa. At room temperature, a jump of the Raman peak position was observed at 30 GPa and the peak vanishes at 89 GPa. These results are consistent with previous X‐ray diffraction studies which showed phase transitions at 30 and 90 GPa. The vanishing of the Raman peak suggests a metallization transition. The pressure dependence of the Mn 2+ d–d transition observed in optical absorptions was consistent with the crystal field theory up to around 25 GPa at room temperature.