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标题：Sub-lattice of Jahn-Teller centers in hexaferrite crystal
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作者：V. V. Gudkov ; M. N. Sarychev ; S. Zherlitsyn 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
页码：1-15
DOI：10.1038/s41598-020-63915-7
出版社：Springer Nature
摘要：A novel type of sub-lattice of the Jahn-Teller (JT) centers was arranged in Ti-doped barium hexaferrite BaFe12O19. In the un-doped crystal all iron ions, sitting in five different crystallographic positions, are Fe3 in the high-spin configuration (S = 5/2) and have a non-degenerate ground state. We show that the electron-donor Ti substitution converts the ions to Fe2 predominantly in tetrahedral coordination, resulting in doubly-degenerate states subject to the $$E\otimes e$$ problem of the JT effect. The arranged JT complexes, Fe2 O4, their adiabatic potential energy, non-linear and quantum dynamics, have been studied by means of ultrasound and terahertz-infrared spectroscopies. The JT complexes are sensitive to external stress and applied magnetic field. For that reason, the properties of the doped crystal can be controlled by the amount and state of the JT complexes.