Magnetic Anisotropy of (TMTSF)2ClO4 in Relaxed and Quenched States

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Abstract
Measurements of magnetic anisotropy of single crystals of (TMTSF)2ClO4, have been made from 2-300K for the relaxed (R) and quenched (Q) states. In the R state the principal axes of the susceptibility tensor coincide with the TMTSF axes and the anisotropy Is dominated by the molecular diamagnetism. Small changes below 30K are ascribed to anion ordering at TA=25K. Above TA there is a small temperature dependence which is shown to arise from the spin susceptibility (xs) via the g factor anisotropy. This effect can be used to make a new estimate of Xs. In the Q state measurements well below the spin flop field of 3.1 kg give the direction of the antiferromagnetic easy axis which is 420 out of the molecular plane (towards a) and at 73° to the long molecular axis.