Evidence from ⁷⁷Se Knight shifts for triplet superconductivity in (TMTSF)₂PF₆
Lee, I. J. · Chow, D. S. · Clark, W. G. · Strouse, J. · Naughton, M. J. · Chaikin, P. M. · Brown, S. E.
Original · EN
The layered quasi-one-dimensional molecular superconductor (TMTSF)₂PF₆ is a very exotic material with a superconducting order parameter whose ground state symmetry has remained ill-defined. Here we present a pulsed NMR Knight shift (K) study of ⁷⁷Se measured simultaneously with transport in pressurized (TMTSF)₂PF₆. The Knight shift is linearly dependent on the electron spin susceptibility χₛ, and is therefore a direct measure of the spin polarization in the superconducting state. For a singlet superconductor, the spin contribution to the Knight shift, Kₛ, falls rapidly on cooling through the transition. The present experiments indicate no observable change in K between the metallic and superconducting states, and thus strongly support the hypothesis of triplet p-wave superconductivity in (TMTSF)₂PF₆.
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