Kondo Screening Effect and Ferromagnetic Order in UCu2Si2 |
| R. Troća, M. Samsel-Czekałaa and B. Coqblinb
aInstitute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland bLaboratoire de Physique des Solides, CNRS-Université Paris-Sud, 91405 Orsay, France |
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| Electrical resistivity and low temperature magnetoresistivity measurements made on a single crystal of UCu2Si2 are reported. By using as a phonon reference the temperature dependence of the electrical resistivity of ThCu2Si2 we could establish that UCu2Si2 has both a ferromagnetic and a Kondo behaviour. Such a phenomenon can be described by the underscreened Kondo lattice model. The magnetoresistivity revealed the presence of magnetic fluctuations within the ferromagnetic order as it was reported previously for UGe2. Also one of the calculated Fermi surface sheets exhibits nesting properties, being in perfect agreement with the previous neutron diffraction data, supporting the possibility of a presence of the spin density wave phase. In this ternary silicide, where the strong ferromagnetic behaviour exists, this phase is signalised by magnetic fluctuations. |
| DOI: 10.12693/APhysPolA.121.1023 PACS numbers: 73.43.Qt, 75.30.Mb, 75.30.Fv, 71.18.+y |