Direct evidence of dimensionality enhancement of Q1D TMTSF and DMET salts

Abstract

Magnetoresistance measurement was carried out for quasi-one-dimensional (Q1D) organic superconductors, (TMTSF) 2 PF 6 , (DMET) 2 AuI 2 and (DMET) 2 I 3 at 1.2 K up to about 15 kbar. The third angular effect (TAE) is observed in their metallic state as an hump anomaly of the angular dependence of the magnetoresistance. It has been found that the angular width of the TAE hump anomaly increases with increasing hydrostatic pressure. This is the first direct evidence of the dimensionality enhancement by pressure for the Q1D superconductors, where the dimensionality is defined as the anisotropy of the transfer integrals, t y /t x .