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

TitleCompetition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection
Publication TypeJournal Article
Year of Publication2008
AuthorsBobrov NL, Chernobay VN, Naidyuk YG, Tyutrina LV, Naugle DG, Rathnayaka KDD, Bud'ko SL, Canfield PC, Yanson IK
Journal TitleEpl
Volume83
Pages37003
Type of ArticleArticle
ISBN Number0295-5075
Accession NumberISI:000259022600030
KeywordsANTIFERROMAGNETIC, borocarbides, coexistence, LUNI2B2C, POINT-CONTACT SPECTROSCOPY, SINGLE-CRYSTAL ERNI2B2C, superconductors
Abstract

Point contacts (PC) Andreev reflection dV/dI spectra for the antiferromagnetic (T-N similar or equal to 6K) superconductor (T-c similar or equal to 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 T-c directly points to an unusual superconducting order parameter (OP) vanishing at T-c. 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 T-N is observed. Copyright (C) EPLA, 2008.

DOI10.1209/0295-5075/83/37003
Alternate JournalEpl