Abstract
In symmetry induced zero gap Hg 1− x Co x Se for x lower than 1%, magnetization and susceptibility are measured. The magnetization at 4.2 K is very well fitted with isolated Co 2+, whereas, at 1.5 K for the lowest Co concentration, the Co 3+ contribution must be taken into account as a corrective part. The magnetic susceptibility shows two slopes. The first one under 80 K corresponds to antiferromagnetic interactions in agreement with the T 0 obtained from magnetization. The second one above 80 K shows ferromagnetic interactions which cannot be explained in terms of RKKY model and are probably due to the presence of CoSe clusters in our samples.
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