31P NMR Investigation of the Superconductor LiFeP (Tc = 5 K)
  We investigate the static and dynamic spin susceptibility of the 111 type Fe-based superconductor LiFeP with Tc ~ 5 K through the measurement of Knight shift 31K and the spin-lattice relaxation rate 1/T1 at 31P site by nuclear magnetic resonance. The constant 31K, small magnitudes of 1/T1T, along with the resistivity rho ~ T^2 all point to the weak spin correlations in LiFeP. 1/T1T display small enhancement toward Tc, indicating that the superconductivity is intimately correlated with the antiferromagnetic spin fluctuations. 
Huiyuan Man, Shengli Guo, Guoxiang Zhi, Xin Gong, Quan Wang, Cui Ding,   Yankang Jin and Fanlong Ning
cond-mat.supr-con cond-mat.mtrl-sci cond-mat.str-el