INFLUENCE OF THE ANION DISORDER IN THE ORGANIC SUPERCONDUCTOR (TMTSF)(2)CLO4

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.