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Paper detail

Low-temperature ferroelectric phase and magnetoelectric coupling in the underdoped La_2CuO_(4+x)

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.

preprint2012arXivOpen access
Z. ViskadourakisI. RadulovA. P. PetrovićS. MukherjeeB. M. AndersenG. JelbertN. S. HeadingsS. M. HaydenK. KieferS. LandsgesellD. N. ArgyriouC. Panagopoulos
cond-mat.supr-concond-mat.str-elcond-mat.mtrl-sci
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Z. ViskadourakisI. RadulovA. P. PetrovićS. MukherjeeB. M. AndersenG. JelbertN. S. HeadingsS. M. HaydenK. KieferS. LandsgesellD. N. ArgyriouC. Panagopoulos

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