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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Lancaster, T., Blundell, S.J., Pratt, F.L. & Kurmoo, M. (2003). μ+-SR studies of the weak ferromagnets CoCO3 and NiCO3. Physica B condensed matter 326(1-4): 522-526.

Author(s) from Durham


We present the results of zero-field μ+-SR measurements on CoCO3 and NiCO3. Both compounds are rhombohedral antiferromagnets which exhibit a spontaneous weak magnetisation below 22.2 and , respectively. This arises due to an anisotropic superexchange (Dzyaloshinsky–Moriya) interaction. We have studied the temperature dependence of the internal field in the ordered state and the magnetic fluctuations in the paramagnetic state. We describe the possible muon-site obtained from dipolar-field calculations.