Interplay between 3d and 4f magnetism in CeCoPO

C. Geibel; C. Krellner; U. Burkhardt

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Interplay between 3d and 4f magnetism in CeCoPO

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arxiv 0808.0996 v2 pith:E3JW63A5 submitted 2008-08-07 cond-mat.supr-con cond-mat.str-el

Interplay between 3d and 4f magnetism in CeCoPO

C. Krellner , U. Burkhardt , C. Geibel This is my paper

classification cond-mat.supr-con cond-mat.str-el

keywords magnetismcecopoabovebehaviorbelowborderce-ionsco-3d

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The ground state properties of CeCoPO, a homologue of the new high temperature superconductors RFePnO1-xFx, were studied by means of susceptibility, specific heat, and resistivity measurements on polycrystals. The observation of a well defined Curie-Weiss behavior above 230K with mu_eff=2.9mu_B and a ferromagnetic ordering below T_C=75K is similar to what was observed in LaCoPO and points to magnetism of the Co-3d electrons. However, the Ce-ions are on the border to magnetism with a Kondo scale of T_K~40K and show an enhanced Sommerfeld-coefficient of \gamma~200mJ/molK^2.

Interplay between 3d and 4f magnetism in CeCoPO

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