Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection
Date
2008-07-08
Authors
Bobrov, N. L.
Chernobay, V. N.
Naidyuk, Yu. G.
Tyutrina, L. V.
Naugle, D. G.
Rathnayaka, K. D. D.
Bud'ko, Sergey L.
Yanson, I. K.
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IOP Publishing Ltd
Abstract
Point contacts (PC) Andreev reflection dV/dI spectra for the antiferromagnetic (TN≃6 K) superconductor (Tc≃11 K) ErNi2B2C have been measured for the two main crystallographic directions. The observed retention of the Andreev reflection minima in dV/dI up to Tc directly points to an unusual superconducting order parameter (OP) vanishing at Tc. The temperature dependence of the OP was obtained from dV/dI using the recent theory of Andreev reflection including the pair-breaking effect. For the first time the existence of two superconducting OPs in ErNi2B2C is shown. A distinct decrease of both OPs as temperature is lowered below TN is observed.
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Comments
This is the version of the article before peer review or editing, as submitted by an author to European Physical Society Letters (EPL). IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at DOI: 10.1209/0295-5075/83/37003. Copyright 2008 EPLA.