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

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Abstract

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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Most cited references 4

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Magnetism and superconductivity in single-crystalErNi2B2C

W. P. Beyermann, A. Yatskar, B. K. Cho … (1995)

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Temperature and magnetic-field dependence of the superconducting order parameter in Zn studied by point-contact spectroscopy

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Bulk electronic structure of the antiferromagnetic superconducting phase in ErNi2B2C

S Tsuda, T Yokoya, T. Baba … (2007)

We have performed temperature (T) - dependent laser-photoemission spectroscopy of antiferromagnetic (AF) superconductor ErNi2B2C to study the electronic-structure evolution reflecting the interplay between antiferromagnetism and superconductivity. The spectra at the superconducting (SC) phase show a very broad spectral shape. T-dependent SC gap shows a sudden deviation from the BCS prediction just below TN. This observation can be well explained by the theoretical model and thus represents characteristic bulk electronic structure of the AF SC phase for the first time.