Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection
|Title||Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection|
|Publication Type||Journal Article|
|Year of Publication||2008|
|Authors||Bobrov NL, Chernobay VN, Naidyuk YG, Tyutrina LV, Naugle DG, Rathnayaka KDD, Bud'ko SL, Canfield PC, Yanson IK|
|Type of Article||Article|
|Keywords||ANTIFERROMAGNETIC, borocarbides, coexistence, LUNI2B2C, POINT-CONTACT SPECTROSCOPY, SINGLE-CRYSTAL ERNI2B2C, superconductors|
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.