Document Type

Article

Publication Date

2010

Publication Title

Journal of Physics: Conference Series

Abstract

In classical magnetic spin systems, geometric frustration leads to a large number of states of identical energy. We report here evidence from magnetocaloric and related measurements that in Cs2CuBr4 — a geometrically frustrated Heisenberg S= 1/2 triangular antiferromagnet — quantum fluctuations stabilize a series of gapped collinear spin states bounded by first-order transitions at simple increasing fractions of the saturation magnetization for fields directed along the c axis. Only the first of these quantum phase transitions has been theoretically predicted, suggesting that quantum effects continue to dominate at fields much higher than previously considered.

Volume

200

DOI

10.1088/1742-6596/200/2/022008

Rights

⃝c 2010 IOP Publishing Ltd

Included in

Physics Commons

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