Volume 83, Number 3, August 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 July 2008|
Competition of multiband superconducting and magnetic order in ErNi2B2C observed by Andreev reflection
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine 47 Lenin Ave., 61103, Kharkiv, Ukraine
2 Department of Physics, Texas A&M University - College Station, TX 77843-4242, USA
3 Ames Laboratory, Department of Physics and Astronomy, Iowa State University - Ames, IA 50011, USA
Corresponding author: firstname.lastname@example.org
Accepted: 6 June 2008
Point contacts (PC) Andreev reflection dV/dI spectra for the antiferromagnetic ( 6 K) superconductor ( 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.
PACS: 74.45.+c – Proximity effects; Andreev effect; SN and SNS junctions / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
© EPLA, 2008
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