Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection

Details Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection

2008-06-09

arxiv.org/abs/0806.1456v1

Europhysics Letters, 83 (2008) 37003

Physics

Condensed Matter

Superconductivity

5 pages, 5 figs, to be published in Europhys. Lett

Scientific paper

10.1209/0295-5075/83/37003

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.

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