Experimental evidence for the microscopic mechanism of the unusual spin-induced electric polarization in GdMn 2 O 5

Abstract : We report in this paper the temperature evolution of the magnetic structure of GdMn 2 O 5 , 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 Gd 3+ and Mn 3+ spins is found to be responsible for the very large polarization in the Gd compound.
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Submitted on : Thursday, January 31, 2019 - 11:11:26 AM
Last modification on : Wednesday, February 13, 2019 - 10:06:09 AM

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G. Yahia, F. Damay, S. Chattopadhyay, V. Balédent, W. Peng, et al.. Experimental evidence for the microscopic mechanism of the unusual spin-induced electric polarization in GdMn 2 O 5. Physical Review B : Condensed matter and materials physics, American Physical Society, 2018, 97 (8), pp.085128. ⟨10.1103/PhysRevB.97.085128⟩. ⟨hal-02000629⟩

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