H. Hodovanets, S. Ran, S. L. Bud'ko, P. C. Canfield
The influence of local moment magnetism on the boron isotope effect of T$_c$ was studied on single crystals of ErNi$_2$B$_2$C. Values of the partial isotope effect exponent of $\alpha_B$=0.10$\pm$0.02 and $\alpha_B$=0.10$\pm$0.04 were obtained based on two different criteria applied to extract $T_c$. No significant change in the partial isotope effect exponent compared to the ones obtained for LuNi$_2$B$_2$C was observed: pair-breaking due to Er local magnetic moment appears to have no detectable influence on boron isotope effect of T$_c$.
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http://arxiv.org/abs/1203.4131
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