Fig. 4: Exploring the superconducting pairing via TF-μSR.
From: Spin-triplet superconductivity in Weyl nodal-line semimetals
a–c TF-μSR spectra, collected in the superconducting and normal states (i.e., above and below Tc) of LaNiSi (a), LaPtSi (b), and LaPtGe (c). The optimal field values for the TF-μSR measurements were identified from the lower critical field Hc1 and the field-dependent superconducting relaxation rate (see Fig. 2, Supplementary Fig. 8 and Note 6) and correspond to 15, 20, and 30 mT for LaNiSi, LaPtSi, and LaPtGe, respectively. d–f Diamagnetic shift ΔBdia versus the reduced temperature T/Tc for LaNiSi (d), LaPtSi (e), and LaPtGe (f). Here, ΔBdia = Bs − Bappl, with Bs the local magnetic field sensed by implanted muons in the sample and Bappl the applied magnetic field. Due to the formation of the FLL, a diamagnetic field shift appears below Tc. g–i Superfluid density [\({\rho }_{{{{\rm{sc}}}}}(T)\propto {\lambda }_{{{{\rm{eff}}}}}^{-2}(T)\)] as a function of reduced temperature T/Tc for LaNiSi (g), LaPtSi (h), and LaPtGe (i). Solid lines represent fits to a fully-gapped s-wave model. The error bars of λ−2(T) are the SDs obtained from fits of the TF-μSR spectra to Eq. (3) by the musrfit software package52.
