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Intermetallic charge transfer in FeTiO$$_{3}$$ probed by resonant inelastic soft X-ray scattering

軟エックス線非弾性散乱で観測したイルメナイトFeTiO$$_{3}$$のFe$$_{3}$$$$d$$-Ti$$_{3}$$$$d$$金属間電価移動

安居院 あかね; 魚住 孝幸*; 水牧 仁一朗*; K$"a$$"a$mbre, T.*

Agui, Akane; Uozumi, Takayuki*; Mizumaki, Masaichiro*; K$"a$$"a$mbre, T.*

われわれはFeTiO$$_{3}$$の電子状態を調べるために、スウェーデンの放射光共同利用施設MAX-lab1-I511バルクステーションにおいてTi 2$$p$$吸収端での共鳴発光分光測定を行った。測定から得られたRIXSスペクトルは、弾性散乱ピークから-2.5eVと-4.5eVに明確なピークを示した。これらFe$$_{3}$$$$d$$-Ti$$_{3}$$$$d$$の直接金属間電荷移動であることがわかった。この解析にわれわれが開発したダブルクラスターモデルを適応した。

We studied the electronic structure of FeTiO$$_{3}$$. The experimental technique used in this study was Ti 2$$p$$ soft resonant X-ray inelastic scattering spectroscopy (RIXS) and it was carried out at I511-3 at MAX-lab. FeTiO$$_{3}$$ has the ilmenite structure and this is an ordered corundum structure. Ions of Fe and Ti occupy the basal cation planes alternatively in which Fedivalent and Ti is tetravalent. Local symmetry around transition metal ions, both Fe and Ti, are in the distorted Oh symmetry. Butorin et al had reported the RIXS spectra of Ti La,b (Phy. Rev. B55 (1997) 4242) in the 3$$d$$$$^{0}$$ compounds and discussed the charge-transfer transitions from Ti 3$$d$$ - O 2$$p$$ hybridization. In this study, we measured Ti La,b RIXS of FeTiO$$_{3}$$ in detail and the spectra shows rich resonant feature. When the excitation energy is tuned at the well-defined $$e$$$$_{g}$$ peak of Ti L3 X-ray absorption spectrum (XAS), a clear small peak appears at 2.5 eV below from the elastic peak. An additional peak comes up at 4.5 eV below the elastic peak when the excitation energy is tuned at the well defined $$t$$$$_{2g}$$ peak of XAS. The spectral features are attributed to eg and $$t$$$$_{2g}$$ state of Ti 3$$d$$ due to crystal field and charge transfer between Ti 3$$d$$ and O 2$$p$$. We are analyzing the RIXS spectra within the cluster model in order to investigate the clear resonant peaks. By demonstrating a double-cluster model calculation taking into account offull-multiplet, we conclude that the origin of features are attributed to Fe 3$$d$$ $$rightarrow$$ Ti 3$$d$$ charge transfer process with $$d$$-$$d$$ charge transfer form Fe to Ti, e.g. it is due to inter-metallic charge transfer, which is a new essential elementary optical process in RIXS study.

発表言語

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English

掲載資料名

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Physical Review B

巻

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79

号

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9

ページ数

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p.092402_1 - 092402_4

発行年月

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2009/03

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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no keyword

特許データ

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PDF

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AA2008-0923.pdf:0.24MB

論文URL

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https://doi.org/10.1103/PhysRevB.79.092402

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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広報プレスリリース

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論文解説
(JAEA R&D Navigator)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：64.69

分野：Materials Science, Multidisciplinary

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