期刊
PHYSICAL REVIEW B
卷 85, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.174106
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology [20046004, 20340086, 19684011, 22014003, 23684023]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program), Japan
- Grants-in-Aid for Scientific Research [23684023, 19684011] Funding Source: KAKEN
We have investigated the magnetoelectric properties originating from the spin-dependent hybridization between transitionmetal (X) d orbital and ligand ion p orbitals in the noncentrosymmetric crystals Ba2XGe2O7 (X = Mn, Co, Cu). The novelmagnetic-field responses of the electric polarization observed in the staggered antiferromagnets Ba2MnGe2O7 (S = 5/2) and Ba2CoGe2O7 (S = 3/2) can be accounted for by the mean-field approximation based on the d-p hybridization mechanism. In the case of the S = 1/2 helimagnet Ba2CuGe2O7, we have found the metamagnetic transition to the staggered spin state in the high magnetic field region and observed an electric polarization originating from the d-p hybridization mechanism. Especially, the observation of electric polarization not only in the fully spin-polarized state at high magnetic field in Ba2MnGe2O7 but also in all the compounds, under applied external magnetic field, strongly supports the single-spin mechanism of the d-p hybridization as the origin of ferroelectricity in this class of materials. We have examined the transition-metal dependence of the polarization magnitude in Ba2XGe2O7 in terms of the electronic configuration in d levels and found that the unquenched orbital angular momentum determines the magnitude of the electric polarization.
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