engleski

Linear Magnetoelectric Effect in Topological Antiferromagnet Cu3TeO6

We report on linear magnetoelectric effect observed by the static electric polarization measurements in an external magnetic field up to 12 T on topological multidomain antiferromagnet Cu3TeO6. The polarization is non-zero only below the Néel temperature and for E⊥H . The magnetization data show spin reorientation taking place already in H< 1 T. This is fully captured by the anisotropic Heisenberg spin Hamiltonian, revealing the change of the magnetic point group from 3¯ ' in the ground state to m in the applied magnetic field, in agreement with the observed magnetoelectric effect. Both point groups allow the ferrotoroidic order which could be a source of magnetoelectric effect in this system. Our results establish Cu3TeO6 as a playground for the study of magnetoelectric topological antiferromagnets and a host of several phenomena which are of interest for future spintronic devices.

Magnetoelectrics, cuprates, antiferromagnets with domains, topological antiferromagnets, ferrotoroidal order

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