Magnetic properties of weakly doped antiferromagnets

• Tipo: Artigo em Revista Científica Internacional
• Data: 1999

Autores

I. R. Pimentel (Autor) FEUP; F. Carvalho Dias (Autor) FEUP; L. M. Martelo (Autor) FEUP; R. Orbach (Autor) FEUP

Revista

Título: Physical Review B

Páginas: 12329-12334

ISSN: 2469-9950

Editora: American Physical Society

Indexação

ISI Web of Science

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Física > Propriedades da matéria condensada

Outras Informações

DOI: 10.1103/PhysRevB.60.12329

Abstract (EN): We study the spin excitations and the transverse susceptibility of a two-dimensional antiferromagnet doped with a small concentration of holes in the t-J model. The motion of holes generates a renormalization of the magnetic properties. The Green’s functions are calculated in the self-consistent Born approximation. It is shown that the long-wavelength spin waves are significantly softened and the shorter-wavelength spin waves become strongly damped as the doping increases. The spin wave velocity is reduced by the coherent motion of holes, and not increased as has been claimed elsewhere. The transverse susceptibility is found to increase considerably with doping, also as a result of coherent hole motion. Our results are in agreement with experi- mental data for the doped copper oxide superconductors.

Idioma: Inglês

Tipo (Avaliação Docente): Científica