Identifying the multiferroic phase of doped CuFeO_2 using inelastic neutron scattering

Details Identifying the multiferroic phase of doped CuFeO_2 using inelastic neutron scattering Identifying the multiferroic phase of doped CuFeO_2 using inelastic neutron scattering

2010-06-02

arxiv.org/abs/1006.0414v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, Submitted to Physical Review Letters

Scientific paper

We report inelastic neutron scattering measurements that provide a distinct dynamical "fingerprint" for the multiferroic ground state of 3.5% Ga-doped CuFeO_2. The complex ground state is stabilized by the displacement of the oxygen atoms, which are also responsible for the multiferroic coupling predicted by Arima. By comparing the observed and calculated spectrum of spin excitations, we conclude that the magnetic ground state is a distorted screw-type spin configuration that requires a mechanism for magnetoelectric coupling different from the generally accepted spin-current model.

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