The transition from heavy fermion to mixed valence in Ce{sub 1-x}Y{sub x}Al{sub 3}: a quantitative comparison with the Anderson impurity model.

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Phys. Rev. Lett.

DOI:https://doi.org/10.1103/PhysRevLett.104.176402· OSTI ID:979883

Goremychkin, E A; Osborn, R; Sashin, I L; Riseborough, P; Rainford, B D; Adroja, D T; Lawrence, J M

We present a neutron scattering investigation of Ce{sub 1-x}Y{sub x}Al{sub 3} as a function of chemical pressure, which induces a transition from heavy-fermion behavior in CeAl{sub 3} (T{sub K} = 5 K) to a mixed-valence state at x = 0.5 (T{sub K} = 150 K). The crossover can be modeled accurately on an absolute intensity scale by an increase in the k-f hybridization, V{sub kf}, within the Anderson impurity model. Surprisingly, the principal effect of the increasing V{sub kf} is not to broaden the low-energy components of the dynamic magnetic susceptibility but to transfer spectral weight to high energy.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 979883
• Report Number(s): ANL/MSD/JA-65703; PRLTAO; TRN: US1003399
• Journal Information: Phys. Rev. Lett., Vol. 104, Issue 2010; ISSN 0031-9007
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FERMIONS
HYBRIDIZATION
MAGNETIC SUSCEPTIBILITY
NEUTRONS
SCATTERING
VALENCE