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Phase diagram of dirty two-band superconductors and observability of impurity-induced s plus i s state
KTH, School of Engineering Sciences (SCI), Physics, Statistical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics. KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.ORCID iD: 0000-0001-5087-3115
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 2, article id 024517Article in journal (Refereed) Published
Abstract [en]

We investigate the phase diagram of dirty two-band superconductors. This paper primarily focuses on the properties and observability of the time-reversal symmetry-breaking s + is superconducting states, which can be generated in two-band superconductors by interband impurity scattering. We show that such states can appear in two distinct ways. First, according to a previously discussed scenario, the s + is state can form as an intermediate phase at the impurity-driven crossover between s(+/-) and s(++) states. We show that there is a second scenario where domains of the s + is state exists in the form of an isolated dome inside the s(+/-) domain, completely detached from the transition between s(+/-) and s(++) states. We demonstrate that in both cases the s + is state generated by impurity scattering exists in an extremely small interval of impurity concentrations. Although this likely precludes direct experimental observation of the s + is state formation due to this mechanism, this physics leads to the appearance of a region inside both the s(+/-) and s(++) domains with unusual properties due to softening of normal modes.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 95, no 2, article id 024517
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URN: urn:nbn:se:kth:diva-207914DOI: 10.1103/PhysRevB.95.024517ISI: 000400593700009Scopus ID: 2-s2.0-85012300487OAI: oai:DiVA.org:kth-207914DiVA, id: diva2:1103302
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QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-11-29Bibliographically approved

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Silaev, MihailGaraud, JulienBabaev, Egor

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