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Physical properties of quasi-one-dimensional SrNbO3.41 and Luttinger liquid analysis of electrical transport

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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