Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 12: CE: Metal-Insulator Transition 1

TT 12.10: Vortrag

Dienstag, 23. März 2010, 12:00–12:15, H19

Interplay of thermal and quantum spin fluctuations on the Kagome lattice — •Dirk Wulferding^1,2, Patric Scheib¹, Peter Lemmens^1,2, 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.