Phase diagram of Josephson junction between s and s± superconductors in the dirty limit

Koshelev, A. E.

doi:10.1103/PhysRevB.86.214502

Title: Phase diagram of Josephson junction between $s$ and $s_{\pm}$ superconductors in the dirty limit

Journal Article · Sat Dec 01 00:00:00 EST 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.86.214502· OSTI ID:1385613

Koshelev, A. E.

The s ± state in which the order parameter has different signs in different bands is a leading candidate for the superconducting state in the iron-based superconductors. We investigate a Josephson junction between s and s ± superconductors within microscopic theory. Frustration, caused by interaction of the s -wave gap parameter with the opposite-sign gaps of the s ± superconductor, leads to nontrivial phase diagram. When the partial Josephson coupling energy between the s -wave superconductor and one of the s ± bands dominates, s -wave gap parameter aligns with the order parameter in this band. In this case, the partial Josephson energies have different signs corresponding to signs of the gap parameters. In the case of strong frustration, corresponding to almost complete compensation of the total Josephson energy, a nontrivial time-reversal-symmetry breaking (TRSB) state realizes. In this state, all gap parameters become essentially complex. As a consequence, this state provides realization for so-called Φ -junction with finite phase difference in the ground state. The width of the TRSB state region is determined by the second harmonic in Josephson current, ∝ sin ( 2 Φ ) , which appears in the second order with respect to the boundary transparency. Using the microscopic theory, we establish a range of parameters where different states are realized. Our analysis shows insufficiency of the simple phenomenological approach for treatment of this problem.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385613

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 86, Issue 21; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Phase diagram of Josephson junction between s and s ± superconductors in the dirty limit

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Title: Phase diagram of Josephson junction between $s$ and $s_{\pm}$ superconductors in the dirty limit