Cp. Slichter et al., NUCLEAR-MAGNETIC-RESONANCE AND ELECTRON SPINS - SOME HISTORY, ANCIENTAND IN THE MAKING, Philosophical magazine. B. Physics of condensed matter. Statistical mechanics, electronic, optical and magnetic, 74(5), 1996, pp. 545-561
Scaling relationships for NMR spin-lattice reIaxation time T-1 and Gau
ssian transverse relaxation time T-2G are reviewed and applied to anal
yse experiments in the normal state of YBa2Cu4O8. Studies of T-2G in t
he superconducting state are analysed using the theory of Pines and Wr
obel to show a preference for d-state orbital pairing over anisotropic
s-state. Data on C-13 NMR in the normal and superconducting state of
the two dimensional organic conductor (ET)(2)Cu[N(CN)(2)]Br are presen
ted and shown to have great similarity to that of the cuprates.