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TT: Fachverband Tiefe Temperaturen
TT 23: CE: Quantum-Critical Phenomena 2
TT 23.5: Talk
Tuesday, March 15, 2011, 11:30–11:45, HSZ 105
Spinon continuum and the ground state of the quantum kagome system — •Dirk Wulferding1, Peter Lemmens1, Shaoyan Chu2, Tianheng Han2, Young S. Lee2, Yoshihiko Okamoto3, Hiroyuki Yoshida4, Zenji Hiroi3, and Reizo Kato5 — 1IPKM, TU-BS, Braunschweig, Germany — 2MIT, Massachusetts, USA — 3ISSP, Tokyo, Japan — 4NIMS, Tsukuba, Japan — 5IPCR, Riken, Japan
We present a temperature dependent Raman study on different kagome lattice systems. At low temperatures, volborthite shows signs of structural distortions, while in the vesignieite spectra a low energy excitation appears that could be assigned to an emergent magnetic mode. We compare our results to the kagome model system herbertsmithite and discuss the effects of antisite disorder and lattice distortions.
Work supported by DFG, IGSM and NTH.