2007/04/30 by C. Krellner, N. S. Kini, N.S. Kini +9 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.104418
published as Phys. Rev. B 76, 104418 (2007) · accepted in Phys. Rev. B, high quality figures: http://www.cpfs.mpg.de/~krellner/
arxiv created 2007/08/10 · openalex publication_date 2007/09/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have determined the physical ground state properties of the compounds CeRuPO and CeOsPO by means of magnetic susceptibility \ensuremathχ(T), specific heat C(T), electrical resistivity \ensuremathρ(T), and thermopower S(T) measurements. \ensuremathχ(T) reveals a trivalent 4f1 cerium state in both compounds. For CeRuPO a pronounced decrease of \ensuremathρ(T) below 50\phantom\rule0.3em0exK indicates the onset of coherent Kondo scattering, which is confirmed by enhanced S(T). The temperature and magnetic field dependence of \ensuremathχ(T) and C(T) evidence ferromagnetic (FM) order at TC=15\phantom\rule0.3em0exK. Thus, CeRuPO seems to be one of the rare examples of a FM Kondo lattice. In contrast, CeOsPO shows antiferromagnetic order at TN=4.5\phantom\rule0.3em0exK despite only minor changes in lattice parameters and electronic configuration. Additional 31P NMR results support these scenarios. LSDA+U calculations evidence a quasi-two-dimensional electronic band structure, reflecting a strong covalent bonding within the CeO and RuP layers and a weak ioniclike bonding between the layers.