We measured NMR and magnetic susceptibility for the quasi-two-dimensional, weakly XY-like, spin-1/2 square-lattice Heisenberg antiferromagnet [CuCl(pyz)(2)]BF4 (pyz = pyrazine = N2C4H4) near the critical temperature. The Neel temperature T-N and the order-parameter critical exponent beta were obtained from the NMR line broadening as a function of temperature. As the applied field strength (H parallel to c) was increased, T-N increased and beta decreased. This behavior indicates that the field effectively enhanced XY anisotropy. The susceptibility as a function of temperature did not show a clear feature for T_N, but showed field-dependent minima below T_N for both H parallel to c and H parallel to ab, where minimum features disappeared for μH_0 > 2T.
|Data di pubblicazione:||2019|
|Titolo:||Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [CuCl(pyz)2]BF4|
|Rivista:||PHYSICAL REVIEW. B|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevB.99.214403|
|Appare nelle tipologie:||2.1 Articolo su rivista |
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