Kondo Screening Effect and Ferromagnetic Order in UCu_2Si_2

• Authors: R. Troć , M. Samsel-Czekała , B. Coqblin
• Languages of publication: EN

Abstracts

EN

Electrical resistivity and low temperature magnetoresistivity measurements made on a single crystal of UCu_2Si_2 are reported. By using as a phonon reference the temperature dependence of the electrical resistivity of ThCu_2Si_2 we could establish that UCu_2Si_2 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 UGe_2. 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.

Keywords

EN

73.43.Qt; 75.30.Mb; 75.30.Fv; 71.18.+y

Discipline

• 75.30.Fv: Spin-density waves
• 71.18.+y: Fermi surface: calculations and measurements; effective mass, g factor
• 75.30.Mb: Valence fluctuation, Kondo lattice, and heavy-fermion phenomena(see also 71.27.+a Strongly correlated electron systems, heavy fermions; for heavy-fermion superconductors, see 74.70.Tx)
• 73.43.Qt: Magnetoresistance(see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport in magnetic properties and materials)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1023-1025

Dates

published

2012-05

Contributors

author

R. Troć

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland

author

M. Samsel-Czekała

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland

author

B. Coqblin

• Laboratoire de Physique des Solides, CNRS-Université Paris-Sud, 91405 Orsay, France

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Identifiers

DOI

10.12693/APhysPolA.121.1023