Electronic states of alkali-electro-sodalite under pressure

Abstract

Insulator-Metal transition of a bcc electron lattice in the alumino-silicate cage compound, Ag(SiAlO4)6, (A is Na or K) is investigated under high pressure. ESR has been measured to obtain the spin susceptibility that gives the Neel TN and the Weiss Θ temperatures. They were analysed to give the exchange interactions J1 and J2 through the windows with a hexagonal and a square shapes. Finally, the transfer energies t1) and t2 through these windows were shown to follow exponential functions of the pressure with different characteristic pressures, giving rise to a comprehensive interpretation of the pressure dependence of TN and Θ.