N. Matsunaga et al., INFLUENCE OF THE ANION DISORDER IN THE ORGANIC SUPERCONDUCTOR (TMTSF)(2)CLO4, Czechoslovak journal of Physics, 46, 1996, pp. 807-808
The anion-disorder effect for the superconducting phase of (TMTSF)(2)C
lO4 was investigated by resistance measurements for various cooling ra
tes through the ClO4- anion ordering temperature. The resistivity alon
g the a-axis monotonically decreases as decreasing temperature below t
he cooling rate of 0.3K/sec and the residual resistance caused by impe
rfectness of anion ordering increases as increasing cooling rate. The
rate of T-C decrease is proportional to the one of nonmagnetic scatter
ing decided from the residual resistivity, that is, dT(C)/d rho(a) sim
ilar to -1x10(5) (K/(Omega m)), where rho(a) is the resistivity along
the a-axis at 1.5K.