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Magnetic field-induced quasiparticle excitation in Nb3Sn: Evidence for anisotropic s-wave pairing

R. Kadono·K. H. Satoh·A. Koda·T. Nagata·H. Kawano-Furukawa·J. Suzuki·M. Matsuda·K. Ohishi·W. Higemoto·S. Kuroiwa·H. Takagiwa·J. Akimitsu
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Abstract

The response of vortex state to the magnetic field in Nb3Sn is probed using muon spin rotation and small-angle neutron scattering. A transformation of vortex structure between hexagonal and squared lattice is observed over a relatively low field range of 2-3 Tesla. The gradual increase of the magnetic penetration depth with increasing field provides microscopic evidence for anisotropic (or multi-gapped) s-wave pairing suggested by the Raman scattering experiment. This result renders need for careful examination on the difference of electronic properties between Nb3Sn and V3Si.

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R. Kadono, K. H. Satoh, A. Koda, T. Nagata, H. Kawano-Furukawa, J. Suzuki, M. Matsuda, K. Ohishi, W. Higemoto, S. Kuroiwa, H. Takagiwa, J. Akimitsu. 2006-05-30. Magnetic field-induced quasiparticle excitation in Nb3Sn: Evidence for anisotropic s-wave pairing. https://doi.org/10.1103/physrevb.74.024513

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