Distinguishing between s+id and s+is pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect

Shi Zeng Lin, Saurabh Maiti, Andrey Chubukov

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30 Scopus citations

Abstract

The symmetry of the pairing state in iron pnictide superconductor Ba1-xKxFe2As2 is still controversial. At optimal doping (x≈0.4), it is very likely s wave, but for x=1 there are experimental and theoretical arguments for both s wave and d wave. Depending on the choice for x=1, intermediate s+is and s+id states have been proposed for intermediate doping 0.4<x<1. In both states, the time-reversal symmetry is broken and a spontaneous magnetization is allowed. In this work we study a spontaneous magnetization induced by a nonmagnetic defect in the s+is and s+id states by using a perturbation theory and numerical calculations for the Ginzburg-Landau free energy functional. We show that the angular dependence of the magnetization is distinct in these two states due to the difference in symmetry properties of the order parameters. Our results indicate a possible way to distinguish between the s+is and s+id pairing symmetries in multiband superconductors.

Original languageEnglish (US)
Article number064519
JournalPhysical Review B
Volume94
Issue number6
DOIs
StatePublished - Aug 29 2016

Bibliographical note

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© 2016 American Physical Society.

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