標題: Optical properties and magnetochromism in multiferroic BiFeO(3)
作者: Xu, X. S.
Brinzari, T. V.
Lee, S.
Chu, Y. H.
Martin, L. W.
Kumar, A.
McGill, S.
Rai, R. C.
Ramesh, R.
Gopalan, V.
Cheong, S. W.
Musfeldt, J. L.
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-四月-2009
摘要: In order to investigate spin-charge coupling in multiferroic oxides, we measured the optical properties of BiFeO(3). Although the direct 300 K charge gap is observed at 2.67 eV, absorption onset actually occurs at much lower energy with Fe(3+) excitations at 1.41 and 1.90 eV. Temperature and magnetic-field-induced spectral changes reveal complex interactions between on-site crystal-field and magnetic excitations in the form of magnon sidebands. We employ the sensitivity of these magnon sidebands to map out the magnetic-field-temperature phase diagram which demonstrates optical evidence for spin spiral quenching above 20 T and suggests a spin domain reorientation near 10 T.
URI: http://dx.doi.org/10.1103/PhysRevB.79.134425
http://hdl.handle.net/11536/7391
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.79.134425
期刊: PHYSICAL REVIEW B
Volume: 79
Issue: 13
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