Stabilization of local moments in gapless Fermi systems.
نویسندگان
چکیده
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 ueu near the Fermi energy (e50). This model with r51 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. @S0163-1829~96!51946-6#
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عنوان ژورنال:
- Physical review. B, Condensed matter
دوره 54 22 شماره
صفحات -
تاریخ انتشار 1996