Competition of multiband superconducting and magnetic order in ErNi2B2C   observed by Andreev reflection
  Point contacts (PC) Andreev reflection dV/dI spectra for the antiferromagnetic (T_N =6K) superconductor (Tc=11K) ErNi2B2C have been measured for the two main crystallographic directions. Observed retention of the Andreev reflection minima in dV/dI up to Tc directly points to unusual superconducting order parameter (OP) vanishing at Tc. Temperature dependence of OP was obtained from dV/dI using recent theory of Andreev reflection including pair-breaking effect. For the first time existence of a two superconducting OPs in ErNi2B2C is shown. A distinct decrease of both OPs as temperature is lowered below T_N is observed. 
N. L. Bobrov, V. N. Chernobay, Yu. G. Naidyuk, L. V. Tyutrina, D. G.   Naugle, K. D. D. Rathnayaka, S. L. Bud`ko, P. C. Canf...