Electrical Resistance of Quasi-1D Li$_{0.9}$Mo$_{6}$O$_{17}$ at Very High Magnetic Field*

Recently, photoemission experiments, band structure calculations, tunneling, and the description of the electrical resistivity by two power-law terms suggest that Li$_{0.9} $Mo$_{6}$O$_{17}$ is an excellent example of a metallic Luttinger-liquid (LL) [a,b]. The crossover from metallic to insulating-like behavior near $T_M$ = 28 K was addressed by thermal expansion experiments which suggest that a dimensional crossover sets the stage for superconductivity [b]. To obtain more information about the crossover at $T_M$, magnetoresistance measurements were performed under very high magnetic field (0 $< H <$ 23 tesla). The results show that the minimum at $T_M$ increases with increasing $H$. The power-law temperature dependence of the electrical resistance at $T_M (H)$ is also evaluated. [a] C. A. M. dos Santos, M. S. da Luz, Yi-Kuo Yu, J. J. Neumeier, J. Moreno, and B. D. White. Submitted to Phys. Rev. Let. (2007). [b] C. A. M. dos Santos, B. D. White, Yi-Kuo Yu, J. J. Neumeier, and J. A. Souza, Phys. Rev. Let. {\bf98}, 266405 (2007).