期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 25, 期 -, 页码 777-784出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S160057751800423X
关键词
soft X-ray absorption; configuration interaction cluster calculation; 3d transition metal oxide; crystal field effect
资金
- National Natural Science Foundation of China [11704317, U1332105]
- China Postdoctoral Science Foundation [2016M602064]
- Fundamental Research Funds for Central Universities [20720160020]
- Center for Functional Nanomaterials, US DOE Office of Science Facility, at Brookhaven National Laboratory [DE-SC00127041]
Synchrotron-based L-2,L-3-edge absorption spectra show strong sensitivities to the local electronic structure and chemical environment. However, detailed physical information cannot be extracted easily without computational aids. Here, using the experimental Ti L-2,L-3-edges absorption spectrum of SrTiO3 as a fingerprint and considering full multiplet effects, calculations yield different energy parameters characterizing local ground state properties. The peak splitting and intensity ratios of the L-3 and L-2 set of peaks are carefully analyzed quantitatively, giving rise to a small hybridization energy around 1.2 eV, and the different hybridization energy values reported in the literature are further addressed. Finally, absorption spectra with different linearly polarized photons under various tetragonal crystal fields are investigated, revealing a non-linear orbital-lattice interaction, and a theoretical guidance for material engineering of SrTiO3-based thin films and heterostructures is offered. Detailed analysis of spectrum shifts with different tetragonal crystal fields suggests that the eg crystal field splitting is a necessary parameter for a thorough analysis of the spectra, even though it is not relevant for the ground state properties.
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