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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.35: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Evidence for local lattice distortions in giant magnetocapacitive CdCr₂S₄ — Vladimir Gnezdilov^1,2, •Peter Lemmens², Yurii Pashkevich³, Alois Loidl⁴, and Vladimir Tsurkan^4,5 — ¹ILTPE NAS, Ukraine — ²IPKM, TU-BS, Braunschweig, Germany — ³DonFTI NAS, Ukraine — ⁴EP V, Univ. Augsburg, Germany — ⁵IAP AS, Moldova

Pronounced anomalies in intensity, frequency, and width of optical phonon modes were observed in the CdCr₂S₄ spinel. To explain the colossal magnetocapacitive effects in CdCr₂S₄ we developed a scenario based on hybridization effects to be in accordance with the observed enhanced polarizabilities of certain Cr-S displacements and evidence for symmetry reduction.

Work supported by DFG.