Band Structure of Metals under High Pressure. I. Fermi Surface of Na and K

Abstract

The band structures of b.c.c. Na, b.c.c. K and f.c.c. K in highly compressed states are evaluated by A.P.W. method. The Fermi surface of Na is approximately spherically symmetric even when the volume is reduced to 0.2 of the normal state. On the other hand, the Fermi surface of K changes from a sphere at the normal volume to complicated d-like surfaces with increasing pressure. The observed volume change in resistivity of Na and K would have a deep connection with the volume change of the Fermi surface.