Abstract
31 P NMR spectral features in polycrystalline SmCoPO reveal an axially symmetric local magnetic field. At low temperature, the anisotropy of the internal magnetic field increases rapidly, with K a b increasing faster than that of K c . The dominant contribution to this anisotropy arises from Sm-4 f electron contribution over that of Co-3 d . The intrinsic width 2β deviates from linearity with respect to bulk susceptibility below 170 K due to the enhancement of (1/ T 2 ) dynamic , which along with the continuous increase of anisotropy in the internal magnetic field is responsible for the wipe out effect of the NMR signal, well above T C . 1/ T 1 shows large anisotropy confirming a significant contribution of Sm-4 f electron spin fluctuations to 1/ T 1 , arising from indirect RKKY type exchange interaction indicating a non-negligible hybridization between Sm-4 f orbitals and the conduction band, over the itinerant character of the Co-3 d spins. This anisotropy originates from the orientation dependence of χ ′′ ( q ,ω). The 3 d -spin fluctuations in the a b -plane is 2D FM in nature, while along the c -axis, a signature of a weak AFM spin fluctuations superimposed on weak FM spin-fluctuations even in a field of 7 T and far above T N is observed. The enhancement of this AFM fluctuations of the Co-3 d spins along c -axis, at further low temperature is responsible to drive the system to an AFM ordered state.
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