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Interplay between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Co</mml:mtext><mml:mtext> </mml:mtext><mml:mn>3</mml:mn><mml:mi>d</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Ce</mml:mtext><mml:mtext> </mml:mtext><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:mrow></mml:math>magnetism in CeCoAsO
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, ${T}_{C}=75\text{ }\text{K}$. No further transitions are found down to 0.5 K. At 6.5 K a complex Schottky type of anomaly shows up …