Symmetry mode analysis of distorted polar/nonpolar structures in A-site ordered SmBaMn2O6 perovskite

The authors would like to acknowledge the use of Servicio General de Apoyo a la Investigacion from Universidad de Zaragoza. The granted beam time at ALBA synchrotron is appreciated (Proposal No. 2018093038). For financial support, we thank the Spanish Ministerio de Ciencia, Innovacion y Universidades (Projects No. RTI2018-098537-B-C22 and No. RTI2018-098537-B-C21 cofunded by ERDF from EU, and Severo Ochoa FUNFUTURE, CEX2019-000917-S) and Diputacion General de Aragon (Project No. E12-20R).