STRESS-INDUCED MOTION OF TWIN BOUNDARY IN (TMTSF)(2)PF6 SINGLE-CRYSTAL

Motion of twin boundaries in (TMTSF)(2)PF6 was studied. The twin bound ary moves intermittently and chaotically under constant force. Moreove r it moves spontaneously in some regions. The spontaneous motion is in termittent and chaotic. Presumably there are other factors, besides ex ternal stress and position dependent potential, which determine the mo tion. The intermittence and chaos are the essentials of twin boundary motion and they can not be explained as long as the twin boundary is r egarded as a rigid body.