arxiv: 1111.0050 · v2 · pith:2WJZC5SWnew · submitted 2011-10-31 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci· cond-mat.str-el

Low-temperature ferroelectric phase and magnetoelectric coupling in the underdoped La₂CuO_(4+x)

Z. Viskadourakis , I. Radulov , A. P. Petrovi\'c , S. Mukherjee , B. M. Andersen , G. Jelbert , N.S. Headings , S.M. Hayden

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K. Kiefer S. Landsgesell D.N. Argyriou C. Panagopoulos

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classification ❄️ cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

keywords ferroelectricbelowcouplingdevelopmagnetoelectricstateunderdopedaccompanied

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We report the discovery of a ferroelectric ground state below 4.5 K in highly underdoped La_2CuO_(4+x) accompanied by slow charge dynamics which develop below T~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 non-stoichiometric carrier doping.

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Low-temperature ferroelectric phase and magnetoelectric coupling in the underdoped La₂CuO_(4+x)

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