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Phys. Rev. Lett. 91, 207603 (2003) [4 pages]

Muon Spin Relaxation and Susceptibility Studies of the Pure and Diluted Spin 1/2 Kagomé-Like Lattice System (CuxZn1-x)3V2O7(OH2) 2H2O

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A. Fukaya1,*, Y. Fudamoto1, I. M. Gat1, T. Ito1,2, M. I. Larkin1, A. T. Savici1, Y. J. Uemura1, P. P. Kyriakou3, G. M. Luke3, M. T. Rovers3, K. M. Kojima4, A. Keren5, M. Hanawa6, and Z. Hiroi6
1Physics Department, Columbia University, 538 West 120th Street, New York, New York 10027, USA
2Correlated Electron Research Center (CERC), AIST, Tsukuba, Ibaraki 305-8562, Japan
3Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
4Department of Frontier Sciences, The University of Tokyo, Hongo, Bunkyo, Tokyo 114-8656, Japan
5Department of Physics, Technion-Israel Institute of Technnology, Haifa 32000, Israel
6Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Received 7 March 2003; published 12 November 2003

Muon spin relaxation and magnetic susceptibility measurements have been performed on the pure and diluted spin 1/2 kagomé system (CuxZn1-x)3V2O7(OH)2 2H2O. In the pure x=1 system we found a slowing down of Cu spin fluctuations with decreasing temperature towards T∼1   K, followed by slow and nearly temperature-independent spin fluctuations persisting down to T=50  mK, indicative of quantum fluctuations. No indication of static spin freezing was detected in either of the pure (x=1.0) or diluted samples. The observed magnitude of fluctuating fields indicates that the slow spin fluctuations represent an intrinsic property of kagomé network rather than impurity spins.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.207603
DOI:
10.1103/PhysRevLett.91.207603
PACS:
76.75.+i, 75.40.Cx, 75.40.Gb

*Present address: Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai, 980-8577, Japan.

 
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