Quantum critical point in the spin glass-Kondo transition in heavy-fermion systems
dc.contributor.author | Theumann, Alba Graciela Rivas de | pt_BR |
dc.contributor.author | Coqblin, Bernard | pt_BR |
dc.date.accessioned | 2015-01-29T02:16:18Z | pt_BR |
dc.date.issued | 2004 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/109371 | pt_BR |
dc.description.abstract | The Kondo–spin glass competition is studied in a theoretical model of a Kondo lattice with an intrasite Kondo-type exchange interaction treated within the mean-field approximation, an intersite quantum Ising exchange interaction with random couplings among localized spins, and an additional transverse field Γ in the x direction, which represents a simple quantum mechanism of spin flipping, in order to have a better description of the spin glass state and in particular of the quantum critical point (QCP). Taking here a parametrization Γ=αJ²K (where JK is the antiferromagnetic Kondo coupling), we obtain two second order transition lines from the spin glass state to the paramagnetic one and then to the Kondo state. For a reasonable set of the different parameters, the two second order transition lines do not intersect and end in two distinct QCPs. The existence of a QCP in the spin glass–Kondo competition allows one to give a better description of the phase diagrams of some cerium and uranium disordered alloys. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 69, no. 21 (July 2004), 214418, 6 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Ligas de cério | pt_BR |
dc.subject | Pontos criticos | pt_BR |
dc.subject | Sistemas de férmions pesados | pt_BR |
dc.subject | Modelo de ising | pt_BR |
dc.subject | Efeito kondo | pt_BR |
dc.subject | Transições magnéticas | pt_BR |
dc.subject | Diagramas de fase | pt_BR |
dc.subject | Vidros de spin | pt_BR |
dc.subject | Ligas de urânio | pt_BR |
dc.title | Quantum critical point in the spin glass-Kondo transition in heavy-fermion systems | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000503862 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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