Kondo resonance in the neutron spectra of intermediate-valent YbAl sub 3

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.320· OSTI ID:6075074

Walter, U ^[1]; Holland-Moritz, E ^[2]; Fisk, Z ^[3]

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1. II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, 5000 Koeln 41, West Germany (DE) Deutsche Forschungsanstalt fuer Luft und Raumfahrt (DLR), Linder Hoehe, 5000 Koeln (West Germany)
2. II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, 5000 Koeln 41, (West Germany)
3. Los Alamos National Laboratory, Los Alamos, New Mexico (USA)

We have measured the dynamic susceptibility of intermediate-valent YbAl{sub 3} by means of cold-neutron scattering. We find two intense magnetic excitations below 40 meV. One of these, with location around 18 meV at helium temperatures, shifts steadily toward 0 meV with increasing temperatures. While crystal field interactions are unable to account for such a behavior, this excitation is in good agreement with a transition from the {ital f} ground state to a Kondo resonance as described by the Anderson model. In particular, it definitely excludes a gaplike magnetic response with gap width {Delta}=30 meV as asserted earlier.

• OSTI ID: 6075074
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:1; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
BARYONS
COHERENT SCATTERING
COLD NEUTRONS
CRYSTAL FIELD
CRYSTALS
DIFFRACTION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
KONDO EFFECT
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
NEUTRONS
NUCLEONS
PHYSICAL PROPERTIES
POLYCRYSTALS
RARE EARTH ALLOYS
SCATTERING
ULTRALOW TEMPERATURE
YTTERBIUM ALLOYS