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31^P NMR spectral features in polycrystalline SmCoPO reveal an axiallysymmetric local magnetic field. At low temperature, the anisotropy of theinternal magnetic field increases rapidly, with K_ab increasing faster thanthat of K_c. The dominant contribution to this anisotropy arises from Sm-4felectron contribution over that of Co-3d. The intrinsic width 2*(Beta) deviatesfrom linearity with respect to bulk susceptibility below 170 K due to theenhancement of (1/T_2)dynamic, which along with the continuous increase ofanisotropy in the internal magnetic field is responsible for the wipe outeffect of the NMR signal, well above T_C. 1/T_1 shows large anisotropyconfirming a significant contribution of Sm-4f electron spin fluctuations to1/T_1, arising from indirect RKKY type exchange interaction indicating anon-negligible hybridization between Sm-4f orbitals and the conduction band,over the itinerant character of the Co-3d spins. This anisotropy in originatesfrom the orientation dependence of chi"(q,omega). The 3d-spin fluctuations inthe ab plane is 2D FM in nature, while along the c-axis, a signature of a weak2D AFM spin fluctuations superimposed on weak FM spin-fluctuations even in afield of 7 T and far above T_N is observed. The enhancement of this AFMfluctuations of the Co-3d spins along c-axis, at further low temperature isresponsible to drive the system to an AFM ordered state.

Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement