期刊
PHYSICAL REVIEW B
卷 80, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.140412
关键词
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资金
- MEXT of Japan [15104006, 17340104, 16076205]
- JSPS
- Grants-in-Aid for Scientific Research [16076205, 15104006, 17340104] Funding Source: KAKEN
The magnetoelectric response and its quantum relaxation phenomenon have been investigated for a single crystal of yttrium iron garnet. The electric-dipole moments, built in by excess localized electrons forming Fe(2+) sites, never freeze even at the lowest temperature and relax through a quantum tunneling process. Application of magnetic field enhances the dielectric relaxation strength and gives rise to a large magnetocapacitance effect (similar to 13% at 10 K with 0.5 T). We show that this magnetically tunable quantum paraelectricity is associated with the Fe(2+)-based magnetoelectric centers in which the electric polarization depends on the magnetization vector via the spin-orbit coupling.
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