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A brief review on/μSR studies of unconventional Fe-and cr-based superconductors

Science China(Physics,Mechanics & Astronomy) 2018年第12期61卷 3-24页

作者： A.Bhattacharyya D.T.Adroja M.Smidman V.K.Anand ISIS Facility Rutherford Appleton LaboratoryChiltonDidcot OxonOX11OQXUK Department of Physics Ramakrishna Mission Vivekananda Educational and Research InstituteHowrah 711202India Highly Correlated Matter Research Group Physics DepartmentUniversity of JohannesburgAuckland Park 2006South Africa Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH Berlin D-14109Germany

Muon spin relaxation/rotation(μSR) is a vital technique for probing the superconducting gap structure, pairing symmetry and time reversal symmetry breaking, enabling an understanding of the mechanisms behind the unconventional superconductivity of cuprates and Fe-based high-temperature superconductors, which remain a puzzle. Very recently double layered Fe-based superconductors having quasi-2 D crystal structures and cr-based superconductors with a quasi-1D structure have drawn considerable attention. Here we present a brief review of the characteristics of a few selected Fe-and cr-based superconducting materials and highlight some of the major outstanding problems, with an emphasis on the superconducting pairing symmetries of these materials. We focus on μSR studies of the newly discovered superconductors ACa_2Fe_4As_4F_2(A = K, Rb, and Cs), ThFeAsN, and A_2cr_3As_3(A = K, Cs), which were used to determine the superconducting gap structures, the presence of spin fluctuations, and to search for time reversal symmetry breaking in the superconducting states. We also briefly discuss the results of μSR investigations of the superconductivity in hole and electron doped BaFe_2As_2.

关键词： unconventional superconductors iron-based superconductors cr-based superconductors superconducting pairing symmetry time reversal symmetry muon spin rotation/relaxation

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