Commensurate structural modulation in the charge- and orbitally ordered phase of the quadruple perovskite (NaMN&lt;sub&gt;3&lt;/sub&gt;)Mn&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;

Prodi, A.; Daoud-Aladine, A.; Gozzo, F.; Schmitt, B.; Lebedev, O.; van Tendeloo, G.; Gilioli, E.; Bolzoni, F.; Aruga-Katori, H.; Takagi, H.; Marezio, M.; Gauzzi, A.

doi:10.1103/PhysRevB.90.180101

Commensurate structural modulation in the charge- and orbitally ordered phase of the quadruple perovskite (NaMN₃)Mn₄O₁₂

Prodi A, Daoud-Aladine A, Gozzo F, Schmitt B, Lebedev O, van Tendeloo G, Gilioli E, Bolzoni F, Aruga-Katori H, Takagi H, Marezio M & Gauzzi A

Citation

Prodi, A., Daoud-Aladine, A., Gozzo, F., Schmitt, B., Lebedev, O., van Tendeloo, G., … Gauzzi, A. (2014). Commensurate structural modulation in the charge- and orbitally ordered phase of the quadruple perovskite (NaMN₃)Mn₄O₁₂. Physical Review B, 90(18), 180101 (5 pp.). https://doi.org/10.1103/PhysRevB.90.180101

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:9370

By means of synchrotron x-ray and electron diffraction, we studied the structural changes at the charge order transition T_CO=176 K in the mixed-valence quadruple perovskite (NaMN₃)Mn₄O₁₂. Below TCO we find satellite peaks indicating a commensurate structural modulation with the same propagation vector q = (1/2,0,-1/2) of the CE magnetic structure that orders at low temperatures, similarly to the case of simple perovskites such as La_0.5Ca_0.5MnO₃. In the present case, the modulated structure, together with the observation of a large entropy change at T_CO, gives evidence of a rare case of full MN³⁺/Mn⁴⁺ charge and orbital order, consistent with the Goodenough-Kanamori model.