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

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

2006-05-30

arxiv.org/abs/cond-mat/0605718v1

Phys. Rev. B 74, 024513 (2006).

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.74.024513

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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