Abstract
The free-powder magnetisation of RMn 6- x Cr x Sn 6 compounds has been measured for compounds with R = Y, Gd, Tb, Dy, Ho, Er in fields up to 38 T, and interpreted in terms of simple model, which is also outlined in this paper. From the measurements, estimates for the R-3d mean-field coupling constant ( n RT) could be derived for the cases where R = Gd, Tb, Dy, Ho, Er. In turn, the n RT values can be related to the microscopic spin-coupling constant ( J RT). In the case of YMn 6Sn 6 the high-field measurement presents evidence for a very weak antiferromagnetic coupling between the Mn layers. Furthermore, values for the Mn moments (μ Mn) were also derived from the magnetisation measurements. The estimated μ Mn values are of the order of 2.0μ B.
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