Evidence for local lattice distortions in giant magnetocapacitive CdCr2S4

Details Evidence for local lattice distortions in giant magnetocapacitive CdCr2S4 Evidence for local lattice distortions in giant magnetocapacitive CdCr2S4

2007-02-15

arxiv.org/abs/cond-mat/0702362v2

Phys. Rev. B 84, 045106 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

Raman scattering experiments on CdCr2S4 single crystals show pronounced anomalies in intensity and frequency of optical phonon modes with an onset temperature T*=130 K that coincides with the regime of giant magnetocapacitive effects. A loss of inversion symmetry and Cr off-centering are deduced from the observation of longitudinal optical and formerly infrared active modes for T

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