Abstract
Metal-insulator transition in has been studied through charge transport measurements. The resistivity, the Seebeck coefficient, and the Hall coefficient are consistently explained in terms of a simple one-band picture, where a hole with a moderately enhanced mass is itinerant three dimensionally. Contrary to the theoretical prediction [Phys. Rev. B 62, 13 426 (2000)], is unlikely to be an excitonic insulator, and holds a finite carrier concentration down to 4.2 K. Thus the metal-insulator transition in this system is basically driven by localization effects.
- Received 27 May 2003
DOI:https://doi.org/10.1103/PhysRevB.68.233101
©2003 American Physical Society