Abstract
The intrinsic magnetic behaviour of Nd 2Co 14B is interpreted in terms of exchange and crystal field interactions. The ‘spin-tilt’ transition away from the c axis at 37 K cannot be explained simply by a reduction in the exchange field acting on the Nd 3+ ion relative to isomorphous Nd 2Fe 14B; a significant alteration of the crystal field is required. In particular, we find evidence for an important reduction in the strength of the fourth and sixth-order crystal field terms in Nd 2Co 14B relative to Nd 2Fe 14B. A correlation between the low temperature ‘spin-tilt’ transition and occupancy of the 4c transition metal site through the Nd 2(Fe 1− x Co x ) 14B series suggests that this site in the Nd-B planes may be responsible for the changes in the Nd 3+ crystal field.
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