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TT: Fachverband Tiefe Temperaturen
TT 12: CE: Metal-Insulator Transition 1
TT 12.10: Talk
Tuesday, March 23, 2010, 12:00–12:15, H19
Interplay of thermal and quantum spin fluctuations on the Kagome lattice — •Dirk Wulferding1,2, Patric Scheib1, Peter Lemmens1,2, Jens Röder3, Philippe Mendels4, Young Lee5, Wing-Ho Ko5, and Mark de Vries6 — 1IPKM, TU-BS, Braunschweig — 2IGSM, TU-BS, Braunschweig — 3IPTC, TU-BS, Braunschweig — 4Univ. Paris Sud, France — 5MIT, Cambridge, MA, USA — 6CSEC and SC, Univ. Edinburgh, UK
Raman scattering in the Herbertsmithite ZnCu3(OH)6Cl2, the first realization of a Heisenberg spin 1/2 AF on a kagome lattice, shows two components, a high temperature quasi elastic signal and a low temperature, broad maximum, extending to high energy. We have investigated the temperature dependence and symmetry properties of both signals in this highly frustrated material. Work supported by ESF-HFM and DFG.