Magnetotransport Phenomena of α-Type (BEDT–TTF)₂I₃ under High Pressures

Abstract

The magnetotransport phenomenon is investigated in α-type crystals of (BEDT–TTF)₂I₃ which are metallized by applying quasi-hydrostatic pressures. At liquid helium temperatures, a fairly large magnetoresistance which rises in very low field and saturates above 0.5 T is observed. The effect of the magnetic field of 1.2 T is found to be recognizable at temperatures above 50 K. Our interpretation of the phenomenon is that the metal-insulator transition which has been suppressed by the pressure arises again, aided by the magnetic field.