Magnetic behaviour of single crystal anhydrous cupric chloride in the low temperature ordered phase

A “spin-flop” transition has been observed in anhydrous cupric chloride. The antiferromagnetic exchange field, H_e, is of the order of 10 ⁶ Oe so that only the spin-flop field can be measured: this gives H_sf = 4.1 × 10 ⁴ Oe. The ratio of the anisotropy field, H_a, which also acts in the crystal, to H_e is estimated as {H _a}/{H _e} ∼ 8.4 × 10 ^-4.