Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.93: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Anomalies in the excitation spectrum of the spinels CdCr₂S₄ and FeCr₂S₄ — •P. Scheib¹, V. Gnezdilov², K.Y. Choi³, P. Lemmens¹, J. Hemberger⁴, A. Loidl⁴, and V. Tsurkan^4,5 — ¹IPKM, TU Braunschweig, D-38106 Braunschweig — ²B.I. Verkin Inst. for Low Temp. Phys., NASU, 61164 Kharkov — ³IMR, Tohoku Univ., Sendai — ⁴EP V, Univ. Augsburg, 86135 Augsburg — ⁵IAP, Acad. Sci. Moldova, MD-2028, Chisinau

Chalcogenide spinels show exceptional dielectric and magnetic properties, as e.g. large magnetoresistance and magnetocapacitive coupling. Using Raman scattering we study the excitations spectrum of these systems. Pronounced phonon and magnetic anomalies are observed that precede the long range ordered phases. Evidence for phase separation is observed. Work supported by ESF-HFM.