Negative isotope effect of a BCS-like gap; an inelastic light scattering study

In-Sang Yang, M. V. Klein, S. Bud'ko +1

In a prior study of the boron isotope effect on the transition temperature ($T_c$) of $R$Ni${}_2$B${}_2$C ($R$ = Y, Lu) system, a positive isotope effect was observed, e.g., $T_{c}(^{1…