Friday, July 5, 2013

1307.1377 (F. Xiao et al.)

Magnetic transition and spin dynamics in the triangular Heisenberg
antiferromagnet $α$-KCrO$_{2}$

F. Xiao, T. Lancaster, P. J. Baker, F. L. Pratt, S. J. Blundell, J. S. Möller, N. Z. Ali, M. Jansen
We present the results of muon-spin relaxation measurements on the triangular lattice Heisenberg antiferromagnet $\alpha$-KCrO$_{2}$. We observe sharp changes in behaviour at an ordering temperature of $T_{\mathrm{c}}=23$ K, with an additional broad feature in the muon-spin relaxation rate evident at T=13 K, both of which correspond to features in the magnetic contribution to the heat capacity. This behaviour is distinct from both the Li- and Na- containing members of the series. These data may be qualitatively described with the established theoretical predictions for the underlying spin system.
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