Interplay between Co-3d and Ce-4f magnetism in CeCoAsO

Abstract

We have investigated the ground state properties of polycrystalline CeCoAsO by means of magnetization, specific heat and solid state NMR. Susceptibility and specific-heat measurements suggest a ferromagnetic order at about, $T_{\mathrm{C}}$=75 K. No further transitions are found down to 2 K. At 6.5 K a complex Schottky type of anomaly shows up in the specific heat results. The interplay between Ce-4f and Co-3d magnetism being responsible for that anomaly is discussed. Furthermore ${}^{75}$As NMR investigations have been performed to probe the magnetism on a microscopic scale. As-NMR spectra are analysed in terms of first and second order quadrupolar interaction. The anisotropic shift component $K_{\mathrm{ab}}$ and $K_{\mathrm{c}}$ could be derived from the ${}^{75}$As powder spectra. Towards lower temperature a strong shift anisotropy was found. Nonetheless $K_{\mathrm{iso}}$ tracks the bulk susceptibility down to $T=$50 K very well. Furthermore the presence of weak correlations among the Ce ions in the ferromagnetic state is discussed. The observed increase of $C/T$ towards lower temperatures supports this interpretation.

6 pages, 4 figures, Accepted in Physical Review B

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Cited by in corpus (12)

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• Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide CeMnAsO
• Realization of Kondo chain in CeCo${}_2$Ga${}_8$
• Quantum Fluctuations in the Non-Fermi Liquid System CeCo${}_2$Ga${}_8$ Investigated Using $\mu$SR
• Tunable interplay between 3d and 4f electrons in Co-doped iron pnictides
• Atomic-Scale Magnetic Toroidal Dipole under Odd-Parity Hybridization
• Electron Spin Resonance of the itinerant ferromagnets LaCrGe3, CeCrGe3 and PrCrGe3
• ${}^{75}$As NMR study of the antiferromagnetic Kondo lattice compound CeNiAsO
• Anisotropic spin-fluctuations in SmCoPO revealed by 31^P NMR measurement
• Local electromagnetic properties of magnetic pnictides: A comparative study probed by NMR measurement
• Effect of external pressure on the magnetic properties of $R$CoAsO ($R$ = La, Pr, Sm): a $\mu$SR study
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)