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| 題名: | Influence of Fe substitution on the Jahn-Teller distortion and orbital anisotropy in orthorhombic Y(Mn1-: XFex)O3 epitaxial films |
| 作者: | 李明道;Haw, Shu-Chih;Lee, Jenn-Min;Chen, Shin-Ann;Lu, Kueih-Tzu;Lee, Ming-Tao;Pi, Tun-Wen;Lee, Chih-Hao;Hu, Zhiwei;Chen, Jin-Ming |
| 貢獻者: | 理學院物理學系 |
| 日期: | 2016-01-01 |
| 上傳時間: | 2026-04-23 12:06:16 (UTC+8) |
| 出版者: | Royal Society of Chemistry |
| 摘要: | 摘要： Multiferroic YMn 1− x Fe x O 3 (020) ( x = 0.125, 0.25, 0.50) epitaxial thin films with an orthorhombic structure (space group Pbnm ) were prepared on a YAlO 3 (010) substrate by pulsed-laser deposition. Upon Fe substitution, the b -axis was clearly shortened, whereas the a - and c -axes were slightly lengthened based on XRD analysis. To understand the influence of orbital polarization and the Jahn-Teller effect of Mn 3+ on Fe substitution and also the local octahedral-site distortion of Fe 3+ in an environment of Jahn-Teller-active Mn 3+ ions in YMn 1− x Fe x O 3 films, we measured the polarization-dependent X-ray absorption spectra at the Mn-L 2,3 and Fe-L 2,3 edges, and also simulated the experimental spectra using configuration-interaction multiplet calculations. Although Δe g for the Mn 3+ ion decreased from 0.9 eV in pure YMnO 3 to 0.6 eV in the half-Fe-substituted sample, a single e g electron was still strongly constrained to the d 3 y 2 − r 2 orbital for all the Fe concentrations tested. The largest Δe g , 0.5 eV, for the Fe 3+ ion was derived for a sample with 12.5% Fe substitution, and gradually decreased to 0.15 eV for the half-Fe-substituted sample. The local octahedral-site distortion of the Fe 3+ ion inside the YMnO 3 lattice was similar to that of the Mn 3+ ion, whereas the Jahn-Teller distortion and GdFeO 3 -type distortion of the Mn 3+ ion were decreased by the spherical high-spin Fe 3+ ions. The combination of the experimental and theoretical data provides both profound insight into the variation of the Jahn-Teller distortion and orbital anisotropy and instructive information about the magnetic structures in these orthorhombic YMn 1− x Fe x O 3 thin films. The variation of the Jahn-Teller distortion and orbital anisotropy in orthorhombic YMnO 3 single-crystal film upon Fe substitution was reported.
出版日期： 2016-08-02
出處： Dalton transactions : an international journal of inorganic chemistry, 2016-08, Vol.45 (31), p.12393-12399
資源來源： Royal Society of Chemistry
識別號： ISSN: 1477-9226
識別號： EISSN: 1477-9234
識別號： DOI: 10.1039/c6dt01633b |
| 顯示於類別: | [物理學系] 期刊論文
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