Striping of orbital-order with charge-disorder in optimally doped manganites

Chen, Wei-Tin; Wang, Chin-Wei; Cheng, Ching-Chia; Chuang, Yu-Chun; Simonov, Arkadiy; Bristowe, Nicholas C.; Senn, Mark S.

Abstract

The phase diagrams of LaMnO3 perovskites have been intensely studied due to the colossal magnetoresistance (CMR) exhibited by compositions around the 3 8 th doping level. However, phase segregation between ferromagnetic (FM) metallic and antiferromagnetic (AFM) insulating states, which itself is believed to be responsible for the colossal change in resistance under applied magnetic field, has prevented an atomisticlevel understanding of the orbital ordered (OO) state at this doping level. Here, through the detailed crystallographic analysis of the phase diagram of a prototype system (AMnA 0 3 MnB 4 O12), we show that the superposition of two distinct lattice modes gives rise to a striping of OO Jahn-Teller active Mn3+ and charge disordered (CD) Mn3.5+ layers in a 1:3 ratio. This superposition only gives a cancellation of the Jahn-Tellerlike displacements at the critical doping level. This striping of CD Mn3.5+ with Mn3+ provides a natural mechanism though which long range OO can melt, giving way to a conducting state.

Citation

Chen, W.-T., Wang, C.-W., Cheng, C.-C., Chuang, Y.-C., Simonov, A., Bristowe, N. C., & Senn, M. S. (2021). Striping of orbital-order with charge-disorder in optimally doped manganites. Nature Communications, 12(1), Article 6319. https://doi.org/10.1038/s41467-021-26625-w

• Journal Article Type: Article
• Acceptance Date: Oct 18, 2021
• Online Publication Date: Nov 3, 2021
• Publication Date: 2021
• Deposit Date: Oct 18, 2021
• Publicly Available Date: Nov 5, 2021
• Journal: Nature Communications
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Issue: 1
• Article Number: 6319
• DOI: https://doi.org/10.1038/s41467-021-26625-w
• Public URL: https://durham-repository.worktribe.com/output/1229696
• Related Public URLs: https://arxiv.org/abs/2104.14274