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

Mayukh Majumder, Kajal Ghoshray, Amitabha Ghoshray, Anand Pal, Veer P.S. Awana

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5 Citations (Scopus)


31P 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 ab increasing faster than that of K c. The dominant contribution to this anisotropy arises from Sm-4f electron contribution over that of Co-3d. 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-4f electron spin fluctuations to 1=T 1, arising from indirect RKKY type exchange interaction indicating a non-negligible hybridization between Sm-4f orbitals and the conduction band, over the itinerant character of the Co-3d spins. This anisotropy originates from the orientation dependence of x"(q;ω). The 3d-spin fluctuations in the ab-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 7T and far above T N is observed. The enhancement of this AFM fluctuations of the Co-3d spins along c-axis, at further low temperature is responsible to drive the system to an AFM ordered state.

Original languageEnglish
Article number054702
JournalJournal of the Physical Society of Japan
Issue number5
Publication statusPublished - 05-2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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