期刊
PHYSICAL REVIEW B
卷 81, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.064426
关键词
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资金
- EU [NMP3-CT2006- 032616]
- Deutsche Forschungsgemeinschaft [SFB 491]
- Czech Science Foundation [202/09/0682]
The third-order (EH2)-H-2-type magnetoelectric (ME) response of polycrystalline EuTiO3 changes sign under magnetic bias and shows a large anomaly at the antiferromagnetic (AF)-paramagnetic phase boundary below T-N approximate to 5.3 K. It is attributed to critical fluctuations of the AF order parameter reinforced by quantum paraelectric polar correlations. The underlying biquadratic spin-lattice coupling involves electric field induced Dzyaloshinskii-Moriya interaction as described within mean-field approximation. Single domaining by ME annealing (or cooling) significantly enhances the response by additional EH and EH2 effects.
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