Topotactic Reduction‐Driven Crystal Field Excitations in Brownmillerite Manganite Thin Films
Journal Article
·
· Advanced Functional Materials
- University of Science and Technology of China, Hefei (China)
- Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Southern University of Science and Technology (SUSTech), Shenzhen (China); Sun Yat‐sen University, Shenzhen (China)
- Anhui University, Hefei (China)
- University of Science and Technology of China, Hefei (China); Anhui University, Hefei (China); Chinese Academy of Sciences (CAS), Hefei (China)
Topotactic reduction of perovskite oxides offers a powerful approach for discovering novel phenomena, such as superconducting infinite-layer nickelates and polar metallicity, and is commonly accompanied by the emergence of multiple valence states and/or complex crystal fields of transition metals. However, understanding the complex interplay between crystal chemistry, electronic structure, and physical properties at the spin- and orbital-resolved levels in these reduced systems remains elusive. Here, in this study, x-ray absorption spectroscopy, resonant inelastic x-ray scattering (RIXS), and density functional theory calculations are used to uncover topotactic metal-insulator transition and orbital-specific crystal field excitations in brownmillerite La0.67Ca0.33MnO2.5 thin films. The Mn valence states are found to be Mn2+/Mn3+, along with their corresponding populations at octahedral and tetrahedral sites, which effectively weaken the Mn-O hybridization compared to the parent perovskite phase. As a result, La0.67Ca0.33MnO2.5 films exhibit an antiferromagnetic insulating ground state. Moreover, by combining the RIXS measurements on selected single-valence manganites, specifically MnO, LaMnO3, and CaMnO3, with orbital- and spin-resolved density-of-states calculations, the study identifies the dd excitations of octahedrally and tetrahedrally coordinated Mn2+/Mn3+ ions, directly linking the microscopic electronic structure to the macroscopic magnetic/electrical properties.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- Guangdong Innovative and Entrepreneurial Research Team Program; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Anhui Province; Natural Science Foundation of Guangdong Province; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 2525844
- Report Number(s):
- BNL--227627-2025-JAAM
- Journal Information:
- Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 28 Vol. 35; ISSN 1616-301X; ISSN 1616-3028
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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