Anomalous fixed point behavior'' of two Kondo impurities: A reexamination

Journal Article · Mon Feb 07 00:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.916· OSTI ID:5014584

Fye, R M ^[1]

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1. Sandia National Laboratories, MS 1111, P.O. Box 5800, Albuquerque, New Mexico 87185 (United States)

We consider the existence of anomalous fixed point behavior'' for the Kondo two-impurity Hamiltonian. This anomalous'' behavior is predicted by calculations which use the energy-independent coupling constants'' (ECC) approximation. Using well-controlled quantum Monte Carlo methods without the ECC approximation, we find no evidence for anomalous'' behavior. We then show that the ECC approximation is, in general, either inconsistent or uninteresting. These results together strongly suggest that the predicted anomalous'' behavior of two Kondo impurities is simply the result of an unphysical approximation rather than an intrinsic property of the model itself.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5014584
• Journal Information: Physical Review Letters; (United States), Vol. 72:6; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
KONDO EFFECT
METALS
IMPURITIES
CORRELATION FUNCTIONS
HAMILTONIAN FUNCTION
MAGNETIC SUSCEPTIBILITY
MANY-BODY PROBLEM
MONTE CARLO METHOD
RENORMALIZATION
TEMPERATURE DEPENDENCE
CALCULATION METHODS
ELEMENTS
FUNCTIONS
MAGNETIC PROPERTIES
PHYSICAL PROPERTIES
665000* - Physics of Condensed Matter- (1992-)