Low-temperature ferroelectric phase and magnetoelectric coupling in the underdoped La₂CuO(4+x)

Viskadourakis, Z.; Radulov, I.; Petrović, A. P.; Mukherjee, S.; Andersen, B. M.; Jelbert, G.; Headings, N. S.; Hayden, S. M.; Kiefer, K.; Landsgesell, S.

doi:10.1103/PhysRevB.85.214502

arXiv 2011-10-31 DOI 10.1103/PhysRevB.85.214502 0 views

Low-temperature ferroelectric phase and magnetoelectric coupling in the underdoped La₂CuO(4+x)

Viskadourakis, Z. · Radulov, I. · Petrović, A. P. · Mukherjee, S. · Andersen, B. M. · Jelbert, G. · Headings, N. S. · Hayden, S. M. · Kiefer, K. · Landsgesell, S. · Argyriou, D. N. · Panagopoulos, C.

Superconductivity Materials Science Strongly Correlated Electrons

Original · EN

We report the discovery of a ferroelectric ground state below 4.5 K in highly underdoped La₂CuO(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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