Title
Commensurate structural modulation in the charge- and orbitally ordered phase of the quadruple perovskite <tex>$(NaMn_{3})Mn_{4}O_{12}$</tex> Commensurate structural modulation in the charge- and orbitally ordered phase of the quadruple perovskite <tex>$(NaMn_{3})Mn_{4}O_{12}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
90(2014) :18 , 5 p.
ISSN
1098-0121
1550-235X
1098-0121
Article Reference
180101
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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 T-CO 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 La0.5Ca0.5MnO3. 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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/4de3fa/9444.pdf
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