Magnetoelectric and multiferroic properties of ternary copper chalcogenides Cu2MIIMIVS4

G Nénert, T T M Palstra
2009 Journal of Physics: Condensed Matter  
We investigate theoretically the ternary copper chalcogenides with the general formula Cu 2 M II M IV S 4 . This family of compounds can crystallize in two different non-centrosymmetric structures, I42m or Pnm2 1 . We show that all the reported members of Cu 2 M II M IV S 4 having the Pnm2 1 symmetry exhibit a large spontaneous polarization. This result suggests that several of these materials are likely to be multiferroics since they order magnetically at low temperature. We discuss in detail
more » ... n the framework of Landau theory the members Cu 2 MnSnS 4 and Cu 2 MnGeS 4 which should present both a linear magnetoelectric effect and multiferroic behavior. Possible new multiferroic materials in Cu 2 M II M IV S 4 Polar structures having atomic displacements smaller than 1Å with respect to a hypothetical non-polar configuration are considered materials with a high probability of having a phase transition into this configuration at higher temperatures. This concept gave rise to the prediction of a large number
doi:10.1088/0953-8984/21/17/176002 pmid:21825438 fatcat:difoyvpserh3fhndmvsiv4zdy4