Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: CE: Low-dimensional Systems - Materials 2

TT 11.11: Talk

Tuesday, March 23, 2010, 12:15–12:30, H18

Quantum evolution from spin-gap to AF state in a low-dimensional spin system — Vladimir Gnezdilov¹, •Peter Lemmens², Dirk Wulferding², Reinhard Kremer³, Collin Broholm⁴, and Helmuth Berger⁵ — ¹ILTP, Kharkov, Ukraine — ²IPKM, TU-BS, Braunschweig — ³MPI-FKF, Stuttgart — ⁴DPA, Johns Hopkins Univ., Baltimore, USA — ⁵EPFL Lausanne

The low-dimensional spin systems α- and β-TeVO₄ share the same monoclinic crystal symmetry while having a different connectivity of VO₄ octahedra and long range order vs. a quantum disordered ground state, respectively. We report a rich magnetic Raman spectrum and phonon anomalies that evidence strong spin-lattice coupling in both systems. Work supported by DFG.