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19 April 2024

» arxiv » 0806.1456

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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 ;
Date:	9 Jun 2008
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.
Source:	arXiv, 0806.1456
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