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Title: Proximity fingerprint of s ± -superconductivity

Abstract

We suggest a straightforward and unambiguous test to identify possible opposite signs of the superconducting order parameter in different bands proposed for iron-based superconductors (s±-state). We consider the proximity effect in a weakly coupled sandwich composed of a s±-superconductor and a thin layer of the s-wave superconductor. In such system the s-wave order parameter is coupled differently with different s±-gaps and it typically aligns with one of these gaps. This forces the other s±-gap to be anti-aligned with the s-wave gap. In such situation the aligned band induces a peak in the s-wave density of states (DoS), while the anti-aligned band induces a dip. Observation of such contact-induced negative feature in the s-wave DoS would provide a definite proof for s±-superconductivity.

Authors:
;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385601
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Europhysics Letters
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; Journal ID: ISSN 0295-5075
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons, thermal conductivity, energy storage (including batteries and capacitors), superconductivity, defects, spin dynamics

Citation Formats

Koshelev, A. E., and Stanev, V. Proximity fingerprint of s ± -superconductivity. United States: N. p., 2011. Web. doi:10.1209/0295-5075/96/27014.
Koshelev, A. E., & Stanev, V. Proximity fingerprint of s ± -superconductivity. United States. doi:10.1209/0295-5075/96/27014.
Koshelev, A. E., and Stanev, V. Sat . "Proximity fingerprint of s ± -superconductivity". United States. doi:10.1209/0295-5075/96/27014.
@article{osti_1385601,
title = {Proximity fingerprint of s ± -superconductivity},
author = {Koshelev, A. E. and Stanev, V.},
abstractNote = {We suggest a straightforward and unambiguous test to identify possible opposite signs of the superconducting order parameter in different bands proposed for iron-based superconductors (s±-state). We consider the proximity effect in a weakly coupled sandwich composed of a s±-superconductor and a thin layer of the s-wave superconductor. In such system the s-wave order parameter is coupled differently with different s±-gaps and it typically aligns with one of these gaps. This forces the other s±-gap to be anti-aligned with the s-wave gap. In such situation the aligned band induces a peak in the s-wave density of states (DoS), while the anti-aligned band induces a dip. Observation of such contact-induced negative feature in the s-wave DoS would provide a definite proof for s±-superconductivity.},
doi = {10.1209/0295-5075/96/27014},
journal = {Europhysics Letters},
issn = {0295-5075},
number = 2,
volume = 96,
place = {United States},
year = {2011},
month = {10}
}