CeFePO: A Heavy Fermion Metal with Ferromagnetic Correlations - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




CeFePO: A Heavy Fermion Metal with Ferromagnetic Correlations - Condensed Matter > Strongly Correlated Electrons - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The ground state properties of CeFePO, a homologue of the new hightemperature superconductors RFePnO1-xFx, were studied by means ofsusceptibility, specific heat, resistivity, and NMR measurements onpolycrystals. All the results demonstrate that this compound is a magneticallynon-ordered heavy Fermion metal with a Kondo temperature TK~10K, a Sommerfeldcoefficient gamma=700mJ-molK2 and a mass enhancement factor of the order of200. The absence of a Fe-contribution to the effective moment at hightemperatures indicates that the magnetism in CeFePO is completely dominated bythe effect of Ce. Thus the strong electronic correlation effects originate fromthe Ce-4f electrons rather than from the Fe-3d electrons. An enhancedSommerfeld-Wilson ratio R=5.5 as well as a Korringa product S0-T1TK2~0.065 wellbelow 1 indicate the presence of ferromagnetic correlations. Therefore, CeFePOappears to be on the non-magnetic side of a ferromagnetic instability.



Autor: E.M. Brüning, C. Krellner, M. Baenitz, A. Jesche, F. Steglich, C. Geibel

Fuente: https://arxiv.org/







Documentos relacionados