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APS » Journals » Phys. Rev. B » Volume 54 » Issue 22
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Phys. Rev. B 54, R15614–R15617 (1996)

Stabilization of local moments in gapless Fermi systems

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Carlos Gonzalez-Buxton and Kevin Ingersent*
Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440

Received 26 July 1996; revised 20 September 1996; published in the issue dated 1 December 1996

Renormalization-group methods are applied to the Anderson model for a localized level coupled to a Fermi system in which the density of states varies like |ε|r near the Fermi energy (ε=0). This model with r=1 or 2 may describe magnetic impurities in unconventional superconductors and certain semiconductors. The pseudogap suppresses mixed valence in favor of local-moment behavior. However, it also reduces the exchange coupling on entry to the local-moment regime, thereby narrowing the range of parameters within which the impurity spin becomes Kondo screened.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.54.R15614
DOI:
10.1103/PhysRevB.54.R15614
PACS:

*Affiliated with the National High Magnetic Field Laboratory, Tallahassee, Florida.

 
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