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We report on high-field magnetization, specific-heat and electron spinresonance (ESR) studies of the quasi-two-dimensional spin-1/2 Heisenbergantiferromagnet [Cu(pyz)2(HF2)]PF6. The frequency-field diagram of ESR modesbelow TN = 4.38 K is described in the frame of the meanfield theory, confirminga collinear magnetic structure with an easy-plane anisotropy. The obtainedresults allowed us to determine the anisotropy/exchange interaction ratio, A/J= 0.003, and the upper limit for the inter/intra-plane exchange-interactionratio, J'/J = 1/16. It is argued that despite the onset of 3D long-rangemagnetic ordering the magnetic properties of this material (includinghigh-magnetic-field magnetization and non-monotonic field dependence of theNeel temperature) are strongly affected by two-dimensional spin correlations.

Magnetic properties of the quasi-two-dimensional S = 1/2 Heisenberg antiferromagnet [Cu(pyz)2(HF2)]PF6