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

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. Canfield; I. K. Yanson

doi:10.1209/0295-5075/83/37003

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

Superconductivity 2009-04-02 v1

Authors: 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. Canfield , I. K. Yanson

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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.

Keywords

multiband superconductivity magnetic order andreev reflection erni2b2c order parameter point contacts

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@article{arxiv.0806.1456,
  title  = {Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection},
  author = {N. L. Bobrov and V. N. Chernobay and Yu. G. Naidyuk and L. V. Tyutrina and D. G. Naugle and K. D. D. Rathnayaka and S. L. Bud`ko and P. C. Canfield and I. K. Yanson},
  journal= {arXiv preprint arXiv:0806.1456},
  year   = {2009}
}

Comments

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

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

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