Artículo
Kondo physics in a Ni impurity embedded in O-doped Au chains
Di Napoli, Solange Mariel
; Barral, María Andrea
; Roura Bas, Pablo Gines
; Manuel, Luis Oscar
; Llois, Ana Maria
; Aligia, Armando Ángel
Fecha de publicación:
08/2015
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
By means of ab initio calculations we study the effect of O doping of Au chains containing a nanocontact represented by a Ni atom as a magnetic impurity. In contrast to pure Au chains, we find that with a minimum O doping the 5dxz,yz states of Au are pushed up, crossing the Fermi level. We also find that for certain O configurations, the Ni atom has two holes in the degenerate 3dxz,yz orbitals, forming a spin S=1 due to a large Hund interaction. The coupling between the 5dxz,yz Au bands and the 3dxz,yz of Ni states leads to a possible realization of a two-channel S=1 Kondo effect. While this kind of Kondo effect is commonly found in bulk systems, it is rarely observed in low dimensions. The estimated Kondo scale of the system lies within the present achievable experimental resolution in transport measurements. Another possible scenario for certain atomic configurations is that one of the holes resides in a 3dz2 orbital, leading to a two-stage Kondo effect, the second one with SU(4) symmetry.
Palabras clave:
KONDO PHYSICS
,
STRONG CORRELATION
,
MAGNETISM
,
ANDERSON MODEL
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Di Napoli, Solange Mariel; Barral, María Andrea; Roura Bas, Pablo Gines; Manuel, Luis Oscar; Llois, Ana Maria; et al.; Kondo physics in a Ni impurity embedded in O-doped Au chains; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 92; 8; 8-2015; 1-7
Compartir
Altmétricas