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Title: Interplay between interband coupling and ferromagnetism in iron pnictide superconductor/ferromagnet/iron pnictide superconductor junctions

Abstract

An extended eight-component Bogoliubov-de Gennes equation is applied to study the Josephson effect between iron-based superconductors (SCs) with s{sub ±}-wave pairing symmetry, separated by an ferromagnet (FM). The feature of damped oscillations of critical Josephson current as a function of FM thickness, the split of the peaks induced by the interband coupling is much different from that for the junction with the s{sub ±}-wave SCs replaced by s{sub ++}-wave ones. In particular, a 0−π transition as a function of interband coupling strength α is found to always exhibit with the corresponding dip shifting toward the larger α due to enhancing the spin polarization in the FM, while there exits no 0−π transition for the SC with s{sub ++}-wave pairing symmetry. The two features can be used to identify the pairing symmetry in the iron pnictide SC different from the s{sub ++}-wave one in MgB{sub 2}. Experimentally, by adjusting the doping level in the s{sub ±}-wave SCs, one can vary α.

Authors:
;  [1];  [2]
  1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023 (China)
  2. Department of Physics, Yangzhou University, Yangzhou 225002 (China)
Publication Date:
OSTI Identifier:
22314344
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EQUATIONS; FERROMAGNETISM; IRON; JOSEPHSON EFFECT; MAGNESIUM BORIDES; PEAKS; SPIN ORIENTATION; SUPERCONDUCTING JUNCTIONS; SUPERCONDUCTORS; SYMMETRY; THICKNESS

Citation Formats

Liu, S. Y., Tao, Y. C., E-mail: yctao88@163.com, and Hu, J. G.. Interplay between interband coupling and ferromagnetism in iron pnictide superconductor/ferromagnet/iron pnictide superconductor junctions. United States: N. p., 2014. Web. doi:10.1063/1.4894159.
Liu, S. Y., Tao, Y. C., E-mail: yctao88@163.com, & Hu, J. G.. Interplay between interband coupling and ferromagnetism in iron pnictide superconductor/ferromagnet/iron pnictide superconductor junctions. United States. doi:10.1063/1.4894159.
Liu, S. Y., Tao, Y. C., E-mail: yctao88@163.com, and Hu, J. G.. Thu . "Interplay between interband coupling and ferromagnetism in iron pnictide superconductor/ferromagnet/iron pnictide superconductor junctions". United States. doi:10.1063/1.4894159.
@article{osti_22314344,
title = {Interplay between interband coupling and ferromagnetism in iron pnictide superconductor/ferromagnet/iron pnictide superconductor junctions},
author = {Liu, S. Y. and Tao, Y. C., E-mail: yctao88@163.com and Hu, J. G.},
abstractNote = {An extended eight-component Bogoliubov-de Gennes equation is applied to study the Josephson effect between iron-based superconductors (SCs) with s{sub ±}-wave pairing symmetry, separated by an ferromagnet (FM). The feature of damped oscillations of critical Josephson current as a function of FM thickness, the split of the peaks induced by the interband coupling is much different from that for the junction with the s{sub ±}-wave SCs replaced by s{sub ++}-wave ones. In particular, a 0−π transition as a function of interband coupling strength α is found to always exhibit with the corresponding dip shifting toward the larger α due to enhancing the spin polarization in the FM, while there exits no 0−π transition for the SC with s{sub ++}-wave pairing symmetry. The two features can be used to identify the pairing symmetry in the iron pnictide SC different from the s{sub ++}-wave one in MgB{sub 2}. Experimentally, by adjusting the doping level in the s{sub ±}-wave SCs, one can vary α.},
doi = {10.1063/1.4894159},
journal = {Journal of Applied Physics},
number = 8,
volume = 116,
place = {United States},
year = {Thu Aug 28 00:00:00 EDT 2014},
month = {Thu Aug 28 00:00:00 EDT 2014}
}