Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: CE: Low-dimensional Systems - Materials 3

TT 35.2: Vortrag

Mittwoch, 16. März 2011, 14:15–14:30, HSZ 301

Magnetic and phononic excitation spectrum of the spin dimer system Sr₃Cr₂O₈ — •Dirk Wulferding¹, Peter Lemmens¹, Kwang-Yong Choi^1,2, Vladimir Gnezdilov^1,3, Diana Quintero-Castro⁴, Bella Lake⁴, Seunghun Lee⁵, Hiroaki Ueda⁶, Yutaka Ueda⁶, and Joachim Deisenhofer⁷ — ¹IPKM, TU-BS, Braunschweig, Germany — ²Chung-Ang Univ., Seoul, Korea — ³ILTPE NAS, Ukraine — ⁴Helmholtz-Zentrum Berlin, Germany — ⁵Dep. of Phys., Univ. of Virginia, USA — ⁶ISSP, Tokyo, Japan — ⁷EP V, Univ. Augsburg, Germany

We present a Raman spectroscopic investigation of Sr₃Cr₂O₈, a spin dimer system with appreciable interdimer interactions. At T = 275 K the system undergoes a structural phase transition from hexagonal to monoclinic together with strong Jahn-Teller induced orbital fluctuations, that persist down to 120 K. Our temperature dependent study reveals phonon anomalies in this temperature range, as well as two magnetic modes with further decrease of temperature. We compare our results to theoretical calculations and previous neutron and infrared spectroscopic studies.

Work supported by DFG, IGSM and NTH.