Abstract
The low temperature magnetic properties of Pb2MnO4, which crystallises in an acentric but non-polar space group (P21c) that allows piezoelectricity, have been investigated. Magnetisation measurements reveal a sharp transition to an antiferromagnetically ordered state at 18 K. Powder neutron diffraction at 1.5 K shows the spin structure to have a (000) propagation vector with Mn4+ moments of 2.74(2) μB lying in the ab plane. The magnetic symmetry group is P′21c′ which permits piezomagnetism (stress-induced weak ferromagnetism). Possible ‘multipiezo’ properties of coupled magnetisation and electrical polarisation under mechanical stress in Pb2MnO4 are briefly discussed.
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