Lee I J, Brown S E, Clark W G, Strouse M J, Naughton M J, Kang W, Chaikin P M
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2002 Jan 7;88(1):017004. doi: 10.1103/PhysRevLett.88.017004. Epub 2001 Dec 19.
The nature of the superconducting state in quasi-one-dimensional organic conductors has remained controversial since its discovery. Here we present results of (77)Se NMR Knight shift (K(s)) experiments in (TMTSF)(2)PF(6) under 7 kbar of pressure with a magnetic field aligned along the most conducting a axis. We find no noticeable shift in K(s) upon cooling through the superconducting transition. Since K(s) directly probes the spin susceptibility chi(s), the fact that chi(s) remains unchanged through the superconducting transition strongly suggests spin-triplet superconductivity.
自准一维有机导体中的超导态被发现以来，其性质一直存在争议。在此，我们展示了在7千巴压力下，磁场沿最具导电性的a轴排列时，对(TMTSF)₂PF₆进行(77)Se核磁共振奈特位移(Kₛ)实验的结果。我们发现在冷却通过超导转变时，Kₛ没有明显变化。由于Kₛ直接探测自旋磁化率χₛ，χₛ在超导转变过程中保持不变这一事实强烈表明是自旋三重态超导。
