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Magnetic signatures of domain walls in s plus is and s plus id superconductors: Observability and what that can tell us about the superconducting order parameter
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
Univ Leeds, Sch Math, Leeds LS2 9JT, W Yorkshire, England..
KTH, School of Engineering Sciences (SCI), Physics.
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2020 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 101, no 5, article id 054507Article in journal (Refereed) Published
Abstract [en]

One of the defining features of spontaneously broken time-reversal symmetry (BTRS) is the existence of domain walls, the detection of which would be strong evidence for such systems. There is keen interest in BTRS currently, in part, due to recent muon spin rotation experiments, which have pointed towards Ba1-xKxFe2As2 exhibiting a remarkable case of s-wave superconductivity with spontaneously broken time-reversal symmetry. A key question, however, is how to differentiate between the different theoretical models which describe such a state. Two particularly popular choices of model are s + is and s + id superconducting states. In this paper, we obtain solutions for domain walls in s + is and s + id systems, including the effects of lattice anisotropies. We show that, in general, both models exhibit spontaneous magnetic fields that extend along the entire length of the domain wall. We demonstrate the qualitative difference between the magnetic signatures of s + is and s + id domain walls and propose a procedure to extract the superconducting pairing symmetry from the magnetic-field response of domain walls.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2020. Vol. 101, no 5, article id 054507
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Physical Sciences
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URN: urn:nbn:se:kth:diva-269453DOI: 10.1103/PhysRevB.101.054507ISI: 000514314500002Scopus ID: 2-s2.0-85079790156OAI: oai:DiVA.org:kth-269453DiVA, id: diva2:1413378
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QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10Bibliographically approved

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Benfenati, AndreaBarkman, MatsBabaev, Egor

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