Magnetic fluctuations in the magnetically ordering heavy-fermion compounds UCu/sub 5/ and U/sub 2/Zn/sub 17/

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.36.1981· OSTI ID:6040428

Walter, U; Loewenhaupt, M; Holland-Moritz, E; Schlabitz, W

We report on the first direct observation of magnetic fluctuations in magnetically ordering heavy-fermion U systems above T/sub N/. They were measured for UCu/sub 5/ and U/sub 2/Zn/sub 17/ via the quasielastic lines by inelastic neutron scattering. Both compounds behave very similarly. We observe a common broad Lorentzian quasielastic line with width of order GAMMA/sub QE/approx. =10 meV, virtually unaffected by the magnetic phase transition, but also a narrow Gaussian quasielastic line, which we attribute to critical spin fluctuations. We discuss the occurrence of magnetic order in spite of the fast valence-fluctuation rate as in contrast to similar magnetically ordering 4f systems.

• Research Organization: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 6040428
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTINIDE ALLOYS
ALLOYS
ANGULAR MOMENTUM
COHERENT SCATTERING
COPPER ALLOYS
CRYSTALS
DIFFRACTION
FLUCTUATIONS
INELASTIC SCATTERING
INTERMETALLIC COMPOUNDS
LINE WIDTHS
MAGNETIC PROPERTIES
NEUTRON DIFFRACTION
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
POLYCRYSTALS
SCATTERING
SPIN
TIME-OF-FLIGHT METHOD
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VARIATIONS
VERY LOW TEMPERATURE
ZINC ALLOYS