31P NMR investigations on the ferromagnetic quantum critical system YbNi4P2

R. Sarkar, P. Khuntia, C. Krellner, C. Geibel, F. Steglich, M. Baenitz
2012 Physical Review B  
We studied the new heavy-fermion system YbNi_4P_2, which presents strong ferromagnetic correlations, using the local ^31P NMR probe over a wide field (0.2-8.6 T) and temperature (1.8-200 K) range. ^31P NMR Knight shift provides the static spin susceptibility which tracks the bulk susceptibility whereas the spin-lattice relaxation rate ^31(1/T_1) provide information about the fluctuations of the Yb 4f moment. The Korringa law is valid over a wide range in temperature and field. The Korringa
more » ... ct ^31(1/T_1TK^2S_0) ≪ 1 gives evidence for the presence of strong ferromagnetic correlations. Over two decades in temperature a ^31(1/T_1T) ∼ T^-3/4 behaviour was found.
doi:10.1103/physrevb.85.140409 fatcat:gn7u4u2guzejjoo4vz3g6pwnyu