TY - JOUR
T1 - Electric polarization, magnetoelectric effect, and orbital state of a layered iron oxide with frustrated geometry
AU - Nagano, A.
AU - Naka, M.
AU - Nasu, J.
AU - Ishihara, S.
PY - 2007/11/19
Y1 - 2007/11/19
N2 - A layered iron oxide RFe2O4 (R denotes rare-earth-metal elements) is an exotic dielectric material with charge-order (CO) driven electric polarization and magnetoelectric effect caused by spin-charge coupling. In this paper, a theory of electronic structure and dielectric property in RFe2O4 is presented. Charge frustration in paired-triangular lattices allows a charge imbalance without inversion symmetry. Spin frustration induces reinforcement of this polar CO by a magnetic ordering. We also analyze an orbital model for the Fe ion which does not show a conventional long-range order.
AB - A layered iron oxide RFe2O4 (R denotes rare-earth-metal elements) is an exotic dielectric material with charge-order (CO) driven electric polarization and magnetoelectric effect caused by spin-charge coupling. In this paper, a theory of electronic structure and dielectric property in RFe2O4 is presented. Charge frustration in paired-triangular lattices allows a charge imbalance without inversion symmetry. Spin frustration induces reinforcement of this polar CO by a magnetic ordering. We also analyze an orbital model for the Fe ion which does not show a conventional long-range order.
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U2 - 10.1103/PhysRevLett.99.217202
DO - 10.1103/PhysRevLett.99.217202
M3 - Article
AN - SCOPUS:36249014171
SN - 0031-9007
VL - 99
JO - Physical Review Letters
JF - Physical Review Letters
IS - 21
M1 - 217202
ER -