KONDO RESONANCE IN THE NEUTRON-SPECTRA OF INTERMEDIATE-VALENT YBAL3

Article

关键词: CONSISTENT PERTURBATION-THEORY;    CRYSTAL-FIELD SPECTROSCOPY;    INTERMETALLIC COMPOUNDS;    DYNAMIC SUSCEPTIBILITY;    CE COMPOUNDS;    SCATTERING;    IMPURITY;    FLUCTUATIONS;    YTTERBIUM;    STATES;   

DOI  :  10.1103/PhysRevB.43.320

来源: SCIE

【 摘 要 】

We have measured the dynamic susceptibility of intermediate-valent YbAl3 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 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.

【 授权许可】

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