Dresden 2006 – scientific programme
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.93: Poster
Wednesday, March 29, 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. Tsurkan4,5 — 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.