期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 22, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/6/065702
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资金
- ESF
- FCT (Portugal) [PTDC/FIS/64926/2006]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/64926/2006] Funding Source: FCT
Using the Kotliar and Ruckenstein slave boson formalism we consider the finite-U Anderson lattice. We study the appearance of superconductivity as a function of the Coulomb repulsion, density and f-level location for s-wave and d-wave pairing symmetries. The results extend previous studies where the infinite-U limit was considered, confirming that superconductivity remains as the Coulomb coupling increases, if the attractive interaction is not weak. Superconductivity disappears for large U as the filling of the heavy particles approaches one, as expected. Since U is finite, superconductivity occurs, in general, for any band-filling being depressed near half-filling, particularly for d-wave symmetry.
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