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Title: Structural and electronic response of U{sub 3}Fe{sub 4}Ge{sub 4} to high pressure

Structural, magnetic, and electrical properties have been studied on a U{sub 3}Fe{sub 4}Ge{sub 4} single crystal under hydrostatic pressure. The orthorhombic crystal structure is found to be stable up to 30 GPa, the highest applied pressure, but the compressibility is strongly anisotropic. Contrary to typical uranium intermetallics for which the softest lattice direction is along the shortest inter-uranium links, in U{sub 3}Fe{sub 4}Ge{sub 4} the lattice is compressed most in a perpendicular direction for the high pressure range. The elastic properties are modified considerably in the vicinity of 1 GPa when the b axis is transformed from least compressible to most compressible. The bulk modulus is found to be about 150 GPa. The anomalies in the elastic properties are reflected in the electronic properties that consistently indicate a change of the magnetic ground state from ferromagnetic to antiferromagnetic. Both types of order exhibit a gap in the magnon spectrum; however, it is twice as high for the ferromagnetic state. The magnetoresistance reveals field-induced transitions of different origins in the antiferromagnetic state along the easy and hard magnetization directions.
Authors:
 [1] ;  [2] ; ; ;  [1] ; ;  [3] ; ; ; ;  [4] ;  [5]
  1. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague (Czech Republic)
  2. (Portugal)
  3. Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague (Czech Republic)
  4. European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe (Germany)
  5. CCTN, IST/CFMCUL, University of Lisbon, Nuclear and Technological Campus, P-2695-066 Bobadela (Portugal)
Publication Date:
OSTI Identifier:
22399301
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; ANTIFERROMAGNETISM; COMPRESSIBILITY; ELASTICITY; FERROMAGNETISM; GERMANIUM; GROUND STATES; INTERMETALLIC COMPOUNDS; IRON; MAGNETIZATION; MAGNETORESISTANCE; MAGNONS; MONOCRYSTALS; ORTHORHOMBIC LATTICES; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; URANIUM