Interplay between 3d and 4f magnetism in CeCoPO

Details Interplay between 3d and 4f magnetism in CeCoPO Interplay between 3d and 4f magnetism in CeCoPO

2008-08-07

arxiv.org/abs/0808.0996v2

Physica B 404, 3206 (2009)

Physics

Condensed Matter

Superconductivity

Fig 1 and Ref. updated, typos corrected

Scientific paper

10.1016/j.physb.2009.07.046

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.

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