Anomalous proximity effects at the interface of s - and s± - superconductors

Stanev, Valentin G.; Koshelev, Alexei E.

doi:10.1103/PhysRevB.86.174515

Title: Anomalous proximity effects at the interface of $s$ - and $s_{\pm}$ - superconductors

Journal Article · Thu Nov 01 00:00:00 EDT 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.86.174515· OSTI ID:1385611

Stanev, Valentin G.; Koshelev, Alexei E.

We study proximity effects close to a boundary between s and s ± superconductors. Frustration, caused by interaction of the s -wave gap parameter with the opposite-sign gaps of s ± superconductor, leads to several anomalous features. In the case of strong frustration a nontrivial time-reversal-symmetry breaking (TRSB) state, with nonzero phase angles between all gap parameters, is possible. In a more typical state, the s -wave order parameter is aligned with one of the s ± gaps. The other (antialigned) gap induces negative feature in the s -wave density of states, which can serve as a fingerprint of the s ± state. Another consequence of the frustration is an extended region in the parameter space in which s -wave superconductivity is suppressed, despite being in contact with nominally stronger superconductor. This negative proximity effect is always present for the TRSB state, but extends even into the aligned states. We study these effects within a simple microscopic model assuming a dirty limit in all bands, which allows us to model the system in terms of minimum number of the most relevant parameters. The described anomalous features provide a route to establishing the possible s ± state in the iron-based superconductors.

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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:: 1385611

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 86, Issue 17; 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: Anomalous proximity effects at the interface of $s$ - and $s_{\pm}$ - superconductors