Positron-annihilation study of the electronic structure of URu sub 2 Si sub 2

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

DOI:https://doi.org/10.1103/PhysRevB.43.9523· OSTI ID:5558196

Rozing, G J; Mijnarends, P E ^[1]; Menovsky, A A; de Chatel, P F ^[2]

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1. Netherlands Energy Research Foundation ECN, 1755 ZG Petten, The Netherlands (NL)
2. Natuurkundig Laboratorium, University of Amsterdam, 1018 XE Amsterdam, (The Netherlands)

Measurements of the two-dimensional angular correlation of annihilation radiation (2D-ACAR) were performed on oriented single crystals of URu{sub 2}Si{sub 2}. The spectra, obtained with integration along four different symmetry directions, display anisotropic structure in fair agreement with a previous calculation of the two-photon momentum distribution. In particular, the contribution of the {ital f}-ligand hybridized electron states is clearly observed and reasonably well described by the band calculation. The 2D-ACAR distribution remains unchanged as the temperature is increased from 6 K in the Fermi-liquid state to 72 K, which is just above the coherence temperature. The inhomogeneity of the positron density in the unit cell complicates the Lock-Crisp-West (LCW) analysis of the experiments in terms of Fermi-surface features. Nevertheless, the disagreement between theory and experiment after LCW folding indicates that the Fermi surface as predicted by local-density-approximation band theory does not apply.

• OSTI ID: 5558196
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:12; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
RUTHENIUM SILICIDES
ELECTRONIC STRUCTURE
URANIUM COMPOUNDS
ANGULAR CORRELATION
ANNIHILATION
BAND THEORY
FERMI LEVEL
MAGNETISM
POSITRONS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
ACTINIDE COMPOUNDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CORRELATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
FERMIONS
INTERACTIONS
LEPTONS
MATTER
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
SILICIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties