| Texto completo | |
| Autor(es): |
de Campos, A.
;
da Luz, M. S.
;
dos Santos, C. A. M.
;
Rice, A. T.
;
Deml, A. M.
;
White, B. D.
;
Neumeier, J. J.
;
Cohn, J. L.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 82, n. 12, p. 7-pg., 2010-09-20. |
| Resumo | |
We report the diagonal components of the electrical resistivity tensor of quasi-one-dimensional SrNbO3.41, determined using the Montgomery method. The results confirm quasi-one-dimensional behavior but show a smaller anisotropy than previously reported. High-resolution linear thermal expansion reveals weakly anisotropic behavior and no evidence of charge-density wave formation, which has been suspected as the cause of the upturn in the electrical resistivity rho near 50 K. Heat-capacity measurements reveal an electronic heat-capacity coefficient that is near zero with a Debye temperature Theta(D)=382(1) K. We report that rho exhibits power-law behavior, as expected within the framework of Luttinger liquid theory for quasi-one-dimensional systems. Detailed analysis of the data above 100 K implies relatively strong correlations and the possibility of a gap in the spin-excitation spectrum. The origin of the small energy gap below 50 K and the conduction mechanism in this region remain as outstanding issues. (AU) | |
| Processo FAPESP: | 07/04572-8 - Propriedades físicas em monocristais de baixa dimensionalidade |
| Beneficiário: | Carlos Alberto Moreira dos Santos |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |