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27 April 2024

» arxiv » cond-mat/0612317

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Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz)_2(ClO_4)_2
T. Lancaster ; S. J. Blundell ; M. L. Brooks ; P. J. Baker ; F. L. Pratt ; J. L. Manson ; M. M. Conner ; F. Xiao ; C. P. Landee ; F. A. Chaves ; S. Soriano ; M. A. Novak ; T. Papageorgiou ; A. Bianchi ; T. Herrmannsdorfer ; J. Wosnitza ; J. A. Schlueter ;
Date:	13 Dec 2006
Subject:	Strongly Correlated Electrons
Abstract:	We present an investigation of magnetic ordering in the two-dimensional S=1/2 quantum magnet Cu(Pz)_2(ClO_4)_2 using specific heat and zero field muon-spin relaxation (mu^+SR). The magnetic contribution to the specific heat is consistent with an exchange strength of 17.7(3) K. We find unambiguous evidence for a transition to a state of three-dimensional long range order below a critical temperature T_N=4.21(1) K using mu^+SR even though there is no feature in the specific heat at that temperature. The absence of a specific heat anomaly at T_N is consistent with recent theoretical predictions. The ratio of T_N/J=0.24 corresponds to a ratio of intralayer to interlayer exchange constants of J’/J =6.8x10^-4, indicative of excellent two-dimensional isolation. The scaled magnetic specific heat of [Cu(Pz)_2(HF_2)]BF_4, a compound with an analogous structure, is essentially identical to that of Cu(Pz)_2(ClO_4)_2 although both differ slightly from the predicted value for an ideal 2D S=1/2 Heisenberg antiferromagnet.
Source:	arXiv, cond-mat/0612317
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