Interplay of Jahn-Teller distortions and orbital order with lattice and local modes in LaMn1-xGaxO3
Understanding the emergence of colossal magnetoresistance (CMR) in optimally-doped La1-xCaxMnO3 (x = 3/8) is an ongoing activearea of research in solid-state chemistry due to its potential technologically relevant in data storage devices. Using a prototype system, we have recently discovered, coincident with the optimal doping regime for CMR, a novel state consisting of striping of orbital order (OO) with charge disorder (CD) occurring in a 1:3 ratio. This striped OO/CD potentially provides a new understanding of the microstructure in the CMR La1-xCaxMnO3 materials, and how this pattern of charge and orbital ordering may couple to the global lattice and strain modes. With our new insight we propose to undertake a variable temperature and composition neutron powder diffraction study on LaMn1-xGaxO3 to better understand how local geometric Jahn-Teller distortions couple to global lattice modes, driving structural phase transitions in the CMR manganites. This will lead to a greater appreciation of how the structure, hence properties of materials with technologically relevant metal-to-insulator transitions, such as CMR, can be systematically tuned.
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Mark S Senn; Catriona Crawford; RITTER Clemens; SIMPSON Struan and TRAGHEIM Ben. (2023). Interplay of Jahn-Teller distortions and orbital order with lattice and local modes in LaMn1-xGaxO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-693
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