Weak ferromagnetism in kappa-(ET)(sub 2)Cu(N(CN)(sub 2))Cl

摘要

We present magnetization measurements at ambient pressure on (kappa)-(ET)(sub 2)Cu(N(CN)(sub 2))Cl, an organic salt that is superconducting under pressure ((Tc) = 12.8 K at 0.3 kbar). An antiferromagnetic transition near 45 K and, for the first time in this class of materials, a transition near 22 K to a state displaying weak ferromagnetic hysteresis with a saturation moment of 8 x 10 (sup (minus)4)(mu)(sub B)/formula are observed. This low temperature state is characterized by a sequence of first order magnetization jumps.