Title: Effects of high pressure on the structural, magnetic, and transport properties of the itinerant 5 f ferromagnet U2Fe3Ge
Authors: HENRIQUES Margarida SousaGORBUNOV DenisANDREEV A VARNOLD Z.SURBLÉ SuzyHEATHMAN StephenGRIVEAU Jean-ChristopheLOPES ElsaPRCHAL J.HAVELA L.GONCALVES A.p.
Citation: PHYSICAL REVIEW B vol. 89 p. 054407-1 - 054407-9
Publisher: AMER PHYSICAL SOC
Publication Year: 2014
JRC N°: JRC84887
ISSN: 1098-0121
URI: http://link.aps.org/doi/10.1103/PhysRevB.89.054407
http://publications.jrc.ec.europa.eu/repository/handle/JRC84887
DOI: 10.1103/PhysRevB.89.054407
Type: Articles in periodicals and books
Abstract: Crystal structure, magnetic and transport properties of the U2Fe3Ge compound have been studied under hydrostatic pressure. U2Fe3Ge crystallizes in the hexagonal crystal structure of the Mg2Cu3Si type, an ordered variant of the MgZn2 Laves structure (C14). The Laves phase has proven highly stable as the crystal structure is maintained up to 27 GPa, the highest applied pressure. X-ray diffraction data revealed that the c-direction, where the shortest U-U bonds lie, is softer than the a-direction. The bulk modulus B0 is about 100 GPa. U2Fe3Ge is an itinerant ferromagnet with the Curie temperature TC = 55 K and spontaneous magnetic moment Ms = 1 μB/f.u. at ambient pressure. The two parameters decrease rapidly under pressure with the rates (ln Ms)/dp = - 0.33 GPa-1 and d(ln TC)/dp = - 0.27 GPa-1. The extrapolation of TC and Ms indicates that the magnetic order will be completely suppressed between 3 and 4 GPa. Electrical resistivity was found to decrease gradually with increasing pressure. The data in the ferromagnetic state indicate the opening of a gap in the magnon spectrum at higher pressures. U2Fe3Ge is relatively more sensitive to pressure than isostructural UNi2.
JRC Directorate:Nuclear Safety and Security

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