Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-15
Phys. Rev. Lett. 104, 017002 (2010)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, Accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.104.017002
We report 29Si-NMR study on a single crystal of the heavy-fermion superconductor CeIrSi3 without an inversion symmetry along the c-axis. The 29Si-Knight shift measurements under pressure have revealed that the spin susceptibility for the ab-plane decreases slightly below Tc, whereas along the c-axis it does not change at all. The result can be accounted for by the spin susceptibility in the superconducting state being dominated by the strong antisymmetric (Rashba-type) spin-orbit interaction that originates from the absence of an inversion center along the c-axis and it being much larger than superconducting condensation energy. This is the first observation which exhibits an anisotropy of the spin susceptibility below Tc in the noncentrosymmetric superconductor dominated by strong Rashba-type spin-orbit interaction.
Haller Elmar
Itoh Kohei M.
Kitaoka Yoshio
Mukuda Hidekazu
Ohara Toshimasa
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