Critical behaviour and magnetic field dependence of the in-plane susceptibility of Rb2CrCl4
作者： W Kleemann , D Otte , K D Usadel , G Brieskorn
DOI: 10.1088/0022-3719/19/3/009
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摘要: The authors have studied the temperature and magnetic field dependence of susceptibility quasi-two-dimensional ferromagnet Rb2CrCl4 by means a mutual inductance method. zero-field measured along easy intraplanar axis diverges with critical exponent gamma , which varies from approximately 1.9 to 1.35 on approaching Tc+=52.1K. This indicates crossover two-dimensional three-dimensional XY-model behaviour. Below Tc field-dependent hard drops discontinuously zero at Bc, between Bc approximately=0.2 T T=0 Bc=0 T=Tc. step-like behaviour chi corresponds second-order canted-to-collinear ferromagnetic phase transition. It is discussed within framework mean-field theory in limits 0 Tc-.
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