Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz)_2(ClO_4)_2

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dc.creatorLancaster, T.
dc.creatorBlundell, S. J.
dc.creatorBrooks, M. L.
dc.creatorBaker, P. J.
dc.creatorPratt, F. L.
dc.creatorManson, J. L.
dc.creatorConner, M. M.
dc.creatorXiao, F.
dc.creatorLandee, C. P.
dc.creatorChaves, F. A.
dc.creatorSoriano, S.
dc.creatorNovak, M. A.
dc.creatorPapageorgiou, T.
dc.creatorBianchi, A.
dc.creatorHerrmannsdorfer, T.
dc.creatorWosnitza, J.
dc.creatorSchlueter, J. A.
dc.date2006-12-13
dc.date.accessioned2026-07-07T08:42:42Z
dc.date.available2026-07-07T08:42:42Z
dc.descriptionWe 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 (μ^+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 μ^+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.
dc.description7 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0612317
dc.identifierhttp://arxiv.org/abs/cond-mat/0612317
dc.identifierPhys. Rev. B 75, 094421 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.094421
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/142058
dc.subjectStrongly Correlated Electrons
dc.titleMagnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz)_2(ClO_4)_2
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