Numerical renormalization-group study of a Kondo hole in a one-dimensional Kondo insulator

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.15917· OSTI ID:399816

Yu, C C ^[1]

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1. Department of Physics and Astronomy, University of California, Irvine, California 92697-4575 (United States)

We have studied a Kondo hole in a one-dimensional Kondo insulator at half-filling using a density matrix formulation of the numerical renormalization group. The Kondo hole introduces midgap states. The spin density introduced by the hole is localized in the vicinity of the hole. It resides primarily in the {ital f} spins for small exchange coupling {ital J} and in the conduction spins for large {ital J}. We present results on the spin gap, charge gap, and neutral gap. The presence of the Kondo hole reduces the charge gap but not the spin gap relative to a Kondo insulator without defects. For small {ital J}, the spin gap is smaller than the charge gap, while for large {ital J}, the spin gap is larger than the charge gap. RKKY interactions are reduced by the Kondo hole as can be seen in the staggered susceptibility. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 399816
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DENSITY MATRIX
ELECTRONIC STRUCTURE
ENERGY GAP
EXCHANGE INTERACTIONS
GROUP THEORY
IMPURITIES
INTERMETALLIC COMPOUNDS
KONDO EFFECT
MAGNETIC SUSCEPTIBILITY
ONE-DIMENSIONAL CALCULATIONS
RARE EARTH COMPOUNDS
RENORMALIZATION
RUDERMAN-KITTEL COUPLING