Journal
PHYSICAL REVIEW B
Volume 81, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.064422
Keywords
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Funding
- Deutsche Forschungsgemeinschaft
- EuroMagNET [228043]
- UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne)
- Argonne, a U. S. Department of Energy, Office of Science Laboratory [DE-AC02-06CH11357]
- APVV [APVV-VVCE-0058-07]
- VEGA [1/0078/09]
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We report on high-field magnetization, specific heat, and electron-spin-resonance (ESR) studies of the quasi-two-dimensional spin-1/2 Heisenberg antiferromagnet [Cu(pyz)(2)(HF2)]PF6. The frequency-field diagram of ESR modes below T-N=4.38 K is described in the frame of the mean-field theory, confirming a collinear magnetic structure with an easy-plane anisotropy. The obtained results allowed us to determine the anisotropy/exchange interaction ratio, A/J=0.003, and the upper limit for the interplane/intraplane exchange interaction ratio, J'/J=1/16. It is argued that despite the onset of three-dimensional long-range magnetic ordering the magnetic properties of this material (including high-magnetic-field magnetization and nonmonotonic field dependence of the Neel temperature) are strongly affected by two-dimensional spin correlations.
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