Title: Variations of magnetic properties of UGa2 under pressure
Authors: KOLOMIETS A. V.GRIVEAU Jean-ChristophePRCHAL J.ANDREEV A.v.HAVELA L
Citation: PHYSICAL REVIEW B vol. 91 p. 064405-1-064405-10
Publisher: AMER PHYSICAL SOC
Publication Year: 2015
JRC N°: JRC94732
ISSN: 1098-0121
URI: http://arxiv.org/abs/1502.04948
http://publications.jrc.ec.europa.eu/repository/handle/JRC94732
DOI: 10.1103/PhysRevB.91.064405
Type: Articles in periodicals and books
Abstract: Electrical resistivity ρ(T) of the 5f -ferromagnet UGa2 was investigated on single-crystalline samples as a function of pressure and magnetic field. Under quasihydrostatic pressure the Curie temperature monotonously increases from TC = 124 K up to 154 K at p = 14.2 GPa afterwhich it turns down steeply and reaches TC = 147 K at p = 15.2GPa. At 20 GPa the compound is already nonmagnetic. This dramatic variation is compatible with the exchange interactions mediated by the 5f hybridization with the non-f states. The external pressure first enhances the exchange coupling of the 5f moment but eventually suppresses the magnetic order by washing out the 5f moments. Such a two-band model is adequate for the weakly delocalized 5f states. The external pressure gradually suppresses the spin-disorder resistivity, which reaches very high ρ values (300 μcm) above TC in UGa2. This leads to the crossover from the initial negative to the positive dρ/dT in the paramagnetic state.
JRC Directorate:Nuclear Safety and Security

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