Nonuniform phases in metals with local moments

Autor(es)

Ghosh, A. ; Miranda, E.

• Tipo de documento: Artigo Científico
• Fonte: Physical Review B; v. 70, p. 214420-214425, Dec. 2004.
• Área do conhecimento: Ciências Exatas e da Terra - Física
• Assunto(s): Ferromagnetismo

Resumo

The two-dimensional Kondo lattice model with both nearest and next-nearest neighbor exchange interactions is studied within a mean-field approach and its phase diagram is determined. In particular, we allow for lattice translation symmetry breaking. We observe that the usual uniform intersite order parameter is never realized, being unstable towards other more complex types of order. When the nearest neighbor exchange J1 is ferromagnetic the flux phase is always the most stable state, irrespective of the value of the next-nearest-neighbor interaction J2. For antiferromagnetic J1, however, either a columnar or a flux phase is realized, depending on conduction electron filling and the value of J2. (AU)

• Processo FAPESP: 01/00719-8 - Métodos não-perturbativos em sistemas eletrônicos correlacionados
• Beneficiário: Amir Ordacgi Caldeira
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 02/03799-5 - Supercondutiva no mgbe e nos cupratos e dimerizacao de spin em redes de kondo.
• Beneficiário: Angsula Ghosh
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado