Dynamics of isolated twin boundary in (TMTSF)2PF6
Control of its mobility
Division of Physics, Graduate School of
Science, Hokkaido University, Sapporo 060-0810, Japan
Accepted: 1 September 1998
Published online: 15 February 1999
Intermittent and irregular motion of isolated twin boundary (kink) in organic crystal (TMTSF)2PF6 was studied at room temperature. Both the local velocity and the time of intermission are determined not only by external stress and temperature but also by the time (tw) elapsed after the backward passage and before the following forward one. When the kink moves after longer tw, its velocity becomes smaller and the time of intermission longer. Both tend to saturate for tw longer than 102 s. This result indicates that some disorder is induced in the lattice by the backward motion and it is relaxed during tw. We also found that the effect of the backward motion of one kink on its following motion is equivalent quantitatively to that of the forward motion of the pair-created counterpart.
PACS: 61.72.Mm – Grain and twin boundaries / 61.66.Hq – Organic compounds / 83.50.By – Transient deformation and flow; time-dependent properties: start-up, stress relaxation, creep, recovery, etc.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999