Fig. 3: Pair-breaking effect in CsV3Sb5.
From: Bulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV3Sb5
a The Temperature dependence of normalized superfluid density Ļs(T)āā”āĪ»2(0)/Ī»2(T) for the pristine (red), 1.3 (orange), 3.3 (green), and 8.6 (blue) C/cm2 irradiated samples. Black solid lines are the fitting curves of the multigap model (clean limit). The black dashed line is the curve for the dirty s-wave (single gap) case. Note that Ļs(T) for the 8.6 C/cm2 irradiated sample with the relatively large value of Ī¾/lā=ā2.3 approaches the dirty limit (see Supplementary Information Sec. V). b Schematic picture of the change in the superconducting gap structure against disorder. The introduction of electron irradiation changes the anisotropic superconducting gap structure to an isotropic one. c Gap sizes obtained from the fitting analysis of the superfluid density as a function of dose. Red circles and blue diamonds represent the maximum and minimum values of the anisotropic gap, \({\Delta }_{{{{{{{{\rm{1,max}}}}}}}}}\) and \({\Delta }_{{{{{{{{\rm{1,min}}}}}}}}}\), respectively. Green squares represent the gap values of the isotropic gap Ī2. Dotted lines are guides for the eyes. d Suppression of Tc in CsV3Sb5 (red circles) as a function of pair breaking parameter gā=āā/(ĻimpkBTc0). For comparison, the results for Sn-substituted CeCoIn5 (yellow triangles)51 and electron-irradiated YBa2Cu3O7-Ī“ (brown triangles)52 are plotted as examples of d-wave superconductors. Black solid line represents the suppression of Tc expected in the Abrikosov-Gor'kov (AG) theory. Also, the results of neutron-irradiated MgB2 (green diamonds)49 and electron-irradiated CeCu2Si2 (purple diamonds)50 are plotted as examples of multigap s-wave superconductors. Dotted lines are guides for the eyes.
