期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 18, 页码 7700-7714出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja211138x
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资金
- European Research Council (ERC) [227987 RLUCIM, 246791 - COUNTATOMS]
- European Community [214040]
- Research Foundation - Flanders [FWOG.0184.09N]
- GOA of the University of Antwerp
- Flemish Governement
- European Union [026019ESTEEM]
- Engineering and Physical Sciences Research Council [EP/H000925/1] Funding Source: researchfish
- EPSRC [EP/H000925/1] Funding Source: UKRI
Pulsed laser deposition has been used to artificially construct the n = 3 Ruddlesden Popper structure La2Sr2Mn3O10 in epitaxial thin film form by sequentially layering La1-xSrxMnO3 and SrO unit cells aided by in situ reflection high energy electron diffraction monitoring. The interval deposition technique was used to promote two-dimensional SrO growth. X-ray diffraction and cross-sectional transmission electron microscopy indicated that the trilayer structure had been formed. A site ordering was found to differ from that expected thermodynamically, with the smaller Sr2+ predominantly on the R site due to kinetic trapping of the deposited cation sequence. A dependence of the out-of-plane lattice parameter on growth pressure was interpreted as changing the oxygen content of the films. Magnetic and transport measurements on fully oxygenated films indicated a frustrated magnetic ground state characterized as a spin glass-like magnetic phase with the glass temperature T-g approximate to 34 K. The magnetic frustration has a clear in-plane (ab) magnetic anisotropy, which is maintained up to temperatures of 150 K. Density functional theory calculations suggest competing antiferromagnetic and ferromagnetic long-range orders, which are proposed as the origin of the low-temperature glassy state.
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