期刊
PHYSICAL REVIEW B
卷 85, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.214502
关键词
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资金
- European Union [MEXT-CT-2006-039047]
- EURYI
- National Research Foundation
- Engineering and Physical Sciences Research Council [EP/C511778/1] Funding Source: researchfish
We report the discovery of ferroelectricity below 4.5 K in highly underdoped La2CuO4+x accompanied by slow charge dynamics which develop below T similar to 40 K. An anisotropic magnetoelectric response has also been observed, indicating considerable spin-charge coupling in this lightly doped parent high-temperature copper-oxide superconductor. The ferroelectric state is proposed to develop from polar nanoregions, in which spatial inversion symmetry is locally broken due to nonstoichiometric carrier doping.
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