Controllable 0 − π transition in iron pnictide superconductor junctions with a spacer of strong ferromagnet

Journal Article · Mon Mar 17 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4869226· OSTI ID:22257706

Liu, S. Y.; Ji, T. T.; Di, Y. S. ^[1]; Hu, J. G. ^[2]

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1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023 (China)
2. Department of Physics, Yangzhou University, Yangzhou 225002 (China)

We investigate the control of 0−π transition in Josephson junctions consisting of a highly spin-polarized ferromagnet coupled to two iron pnictide superconductors (SCs). It is shown that, a 0−π transition as a function of interband coupling strength is always exhibited, which can be experimentally used to discriminate the s{sub ±}-wave pairing symmetry in the iron pnictide SCs from the s{sub ++}-wave one in MgB{sub 2}. By tuning the doping level in the s{sub ±}-wave SCs, one can vary the interband coupling strength so as to obtain the controllable 0−π transition. This device may be realized with current technologies and has practical use in Cooper pair spintronics and quantum information.

• OSTI ID: 22257706
• Journal Information: Applied Physics Letters, Vol. 104, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOPER PAIRS
IRON
JOSEPHSON JUNCTIONS
MAGNESIUM BORIDES
QUANTUM INFORMATION
SPIN ORIENTATION
SUPERCONDUCTORS