Superconducting order parameter in nonmagnetic borocarbides RNi${}_2$B${}_2$C (R=Y, Lu) probed by point-contact Andreev reflection spectroscopy

X. Lu, W. K. Park, S. Yeo +5

We report on the measurements of the superconducting order parameter in the nonmagnetic borocarbides LuNi${}_2$B${}_2$C and YNi${}_2$B${}_2$C. Andreev conductance spectra are obtained from…