Probing the f electrons in URu sub 2 Si sub 2 with positrons: A theoretical investigation

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.9515· OSTI ID:5467596

Rozing, G J; Mijnarends, P E ^[1]; Koelling, D D ^[2]

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1. Netherlands Energy Research Foundation ECN, 1755ZG Petten, The Netherlands (NL)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)

The two-photon momentum distribution for positron annihilation is computed for the heavy-fermion system URu{sub 2}Si{sub 2}. A nonrelativistic approximation of the positron-electron overlap integrals is applied to wave functions obtained from a fully relativistic, self-consistent band-structure calculation. The crystal structure causes a preference of the positron for the uranium site, resulting in a considerable contribution to the two-photon momentum distribution of the {ital f}-electron states and marked structure related to the Fermi surface. Results are presented for integration of the two-photon momentum distribution along the (001) and (101) directions. Subsequent application of the Lock-Crisp-West theorem reveals Fermi-surface effects superimposed on long-wavelength structure due to the inhomogeneity of the positron wave function. It is concluded that positron annihilation can be used to study the nature of the {ital f} electrons in this heavy-fermion system.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5467596
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:12; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDE COMPOUNDS
ALLOY SYSTEMS
ANGULAR CORRELATION
ANNIHILATION
BASIC INTERACTIONS
COLLISIONS
CORRELATIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ENERGY LEVELS
F STATES
FEASIBILITY STUDIES
GAMMA RADIATION
INTERACTIONS
IONIZING RADIATIONS
PARTICLE INTERACTIONS
POSITRON COLLISIONS
PROBES
RADIATIONS
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
SILICON COMPOUNDS
TERNARY ALLOY SYSTEMS
TRANSITION ELEMENT COMPOUNDS
URANIUM COMPOUNDS