Journal
PHYSICAL REVIEW B
Volume 82, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.125117
Keywords
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG-06ER46269]
- National Science Foundation [DMR-0504769, DMR-0907036]
- Research Corporation
- CNPq [201.439/2007-7, 301334/2007-2]
- FAPESP [2007/04572-8]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0907036] Funding Source: National Science Foundation
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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.
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