Elsevier

Physica B+C

Volume 123, Issue 3, February 1984, Pages 271-283
Physica B+C

On the magnetic behaviour of the layered ferromagnets (CH3NH3)2CuCl4 and (CD3ND3)2CuCl4

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Abstract

The layered ferromagnets (CH3NH3)2CuCl4 and (CD3ND3)2CuCl4 have been investigated by means of susceptibility and neutron diffraction experiments. Both compounds are monoclinic below T ≈ 230 K and become ferromagnetic at Tc = 8.903(2) K and Tc = 8.84(1) K, respectively. From high-temperature susceptibility data on (CH3NH3)2CuCl4 the intralayer exchange constant MJk = 19.2(3) K was determined. The fit of a renormalized spin-wave theory to the low-temperature magnetization of (CD3ND3)2CuCl4 resulted in J/k = 19.3(5) K. The two-dimensional (2d) character of the magnetic ordering in the deuterated compound was confirmed by the observation of magnetic neutron scattering along a ridge (00ζ). The critical behaviour of the susceptibility for this compound shows a cross-over from 2d to 3d, as observed previously for (CH3NH3)2CuCl4. From the susceptibility data the anisotropy fields were determined. It is shown that the anisotroy is mainly due to dipolar interactions. To explain the different directions of easy magnetization in the compounds, it is suggested that the respective monoclinic space groups are different.

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