Spin dynamics near the metal-insulator transition in (TMTSF)2ReO4

Abstract

We have studied the metal-insulator transition in the organic superconductor (TMTSF)2ReO4, which is accompanied by anion ordering, by means of electron paramagnetic resonance measurements. As a result, a peculiar spin dynamics, indicative of the opening of the spin gap around the Tc, associated with an antiferromagnetic transition was revealed.