An unidentified magnetic transition in R2Fe14X compounds (R=Sm, Tb, Dy, Ho, Er, and Tm; X=B or C)

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Abstract
In Ho2Fe14B and Ho2Fe14C the temperature dependence of the ac initial susceptibility between 4.2 and 300 K shows two peaks. The peak at the lower temperature can be explained by a well‐known spin reorientation transition (at 62 K for Ho2Fe14B and at 40 K for Ho2Fe14C). The peak at the higher temperature (at 245 K for Ho2Fe14B and at 265 K for Ho2Fe14C) disappears when the external field is applied parallel or perpendicular to the preferential direction of a magnetically aligned sample. The similar peak was also traced for R2Fe14X compounds (R=Sm, Tb, Dy, Ho, Er, and Tm; X=B or C). Searching for the nature of this peak traced by measuring the temperature dependence of the ac susceptibility for 3d‐4f compounds is still under progress.