Metal-insulator transition inCa1−xLixPd3O4
S. Ichikawa, I. Terasaki
Physical Review B (Condensed Matter)
Metal-insulator transition in Ca_1-xLi_xPd_3O_4 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. B62, 13426 (2000)], CaPd_3O_4 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.