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Experimental evidence for the microscopic mechanism of the unusual spin-induced electric polarization in GdMn2O5

Yahia, G.; Damay, F.; Chattopadhyay, S.; Baledent, V.; Peng, W.; Kim, S. W.; Greenblatt, M.; Lepetit, M.-B.; Foury-Leylekian, P.


We report in this paper the temperature evolution of the magnetic structure of GdMn2O5, in the range 2–40 K, studied by neutron diffraction on an isotope-enriched powder. We detail a thorough analysis of the microscopic mechanisms needed to release the different magnetic frustrations that are at the origin of the polarization. In addition to the usual exchange-striction term, known to be at the origin of the polarization in this family, an additional exchange-striction effect between the Gd3+ and Mn3+ spins is found to be responsible for the very large polarization in the Gd compound.

Involved research facilities

  • High Magnetic Field Laboratory (HLD)


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