M. Nagasawa et al., SEMIMETALLIC SPIN-DENSITY-WAVE PHASE IN (TMTSF)2X (X=ASF6 AND PF6) UNDER PRESSURE, Journal of the Physical Society of Japan, 62(11), 1993, pp. 3974-3978
In the spin density wave (SDW) phase of (TMTSF)2AsF6 and (TMTSF)2PF6,
we measured the metal-insulator transition temperature T(MI) and the a
ctivation energy E(A) in the SDW insulating phase under pressure. The
ratio 2E(A)/k(B) T(MI) near the critical pressure approximately 10.5 k
bar, above which the SDW phase does not exist, is examined and compare
d with the mean-field theory developed by Yamaji. We conclude that T(M
I) does not correspond to the normal-SDW transition temperature T(SDW)
but is lower than T(SDW). Non-linear conduction with finite threshold
was observed above T(MI).