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$$mu$$SR measurements on the vortex lattice of CaAlSi; Anisotropic response in magnetic penetration depth

Kuroiwa, Sogo*; Sato, Koki*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki*; Higemoto, Wataru  ; Akimitsu, Jun*

The vortex state defined by two characteristic length scales, magnetic penetration depth ($$lambda$$) and coherence length ($$xi$$), in a layered hexagonal superconductor CaAlSi was probed using muon spin rotation. From preliminary analysis using modified London model, we found that the in-plane $$lambda$$ increases with increasing magnetic field while inter-plane $$lambda$$ is almost independent of magnetic field. The presence of field-induced quasiparticle excitation manifested in the field dependence of $$lambda$$ suggests that CaAlSi has an anisotropic gap structure.

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Category:Chemistry, Multidisciplinary

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