Neutron scattering investigation of the static critical properties of Rb2CrCl4

Abstract

We have investigated the static zero-field critical properties of the ionic ferromagnet Rb₂CrCl₄, using neutron scattering, under conditions such that the quasi-static approximation is valid. A general consideration of the spin Hamiltonian of Rb₂CrCl₄, with S = 2, shows that it approximates the two-dimensional (2D) XY model, with additional weak perturbations. Rb₂CrCl₄ orders three dimensionally at T_c = 52.3 K, and very close to T_c there is a regime of three-dimensional critical behaviour. However, both below and above T_c there is a crossover to regimes of two-dimensional critical fluctuations. In these regimes, there is excellent agreement between experiment and theoretical predictions for a finite-sized 2D XY model, suggesting that Rb₂CrCl₄ is an ideal realization of this system.