Band-filling effects on Kondo-lattice properties
| Autor: | Jose Iglesias, B. Coqblin, Claudine Lacroix, Miguel Angelo Cavalheiro Gusmao |
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| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Physics
Spins Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Kondo insulator Exchange interaction FOS: Physical sciences Bandas de condução Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Magnetic susceptibility Condensed Matter - Strongly Correlated Electrons Efeito kondo Antiferromagnetism Strongly correlated material Condensed Matter::Strongly Correlated Electrons Kondo effect Interações de troca (elétron) Phase diagram |
| Zdroj: | Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Scopus-Elsevier |
| Popis: | We present theoretical results for a Kondo-lattice model with spin-1/2 localized moments, including both the intrasite Kondo coupling and an intersite antiferromagnetic exchange interaction, treated within an extended mean-field approximation. We describe here the case of a non-integer conduction-band filling for which an ``exhaustion'' problem arises when the number of conduction electrons is not large enough to screen all the lattice spins. This is best seen in the computed magnetic susceptibility. The Kondo temperature so obtained is different from the single-impurity one, and increases for small values of the intersite interaction, but the Kondo-effect disappears abruptly for low band filling and/or strong intersite coupling; a phase diagram is presented as a function of both parameters. A discussion of experimental results on cerium Kondo compounds is also given. 9 pages, 8 figures, to appear in Phys Rev B (1 february 2003) |
| Databáze: | OpenAIRE |
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