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Journal Articles

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

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

Physical Review B, 79(9), p.092402_1 - 092402_4, 2009/03

AA2008-0923.pdf:0.24MB

https://doi.org/10.1103/PhysRevB.79.092402
 Times Cited Count：20 Percentile：62.47(Materials Science, Multidisciplinary)

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.

Journal Articles

Resonant O K$$alpha$$ emission spectroscopy of layered manganate La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

Agui, Akane; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Nordgren, J.*; Usuda, Manabu; Saito, Tomohiko*; Moritomo, Yutaka*

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.589 - 592, 2005/06

https://doi.org/10.1016/j.elspec.2005.01.103
 Times Cited Count：1 Percentile：5.68(Spectroscopy)

Current research in the perovskite and layered perovskite-type manganese oxides has expanded to include the study of electronic and magnetic properties such as the colossal magnetoresistance (CMR), orbital ordering and charge ordering. The O K$$alpha$$ soft X-ray emission and absorption spectra (XES and XAS) of La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$ were measured at selected excitation energies in order to investigate the electronic structure. The measurements were carried out by using a soft X-ray emission spectrometer at beamline BW3 at HASYLAB, Germany. The dependence of O K$$alpha$$ XES on excitation-energy was observed. It is attributed the different site of oxygen ions.

Journal Articles

Resonant Mn $$L$$ Emission spectra of layered manganite La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

Agui, Akane; Butorin, S. M.*; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Saito, Tomohiko*; Moritomo, Yutaka*; Nordgren, J.*

Journal of the Physical Society of Japan, 74(6), p.1772 - 1776, 2005/06

https://doi.org/10.1143/JPSJ.74.1772
 Times Cited Count：8 Percentile：48.26(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Electronic structure of iron ilmenite FeTiO$$_3$$

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

no journal, , 

no abstracts in English

Oral presentation

Electronic structure of Fe 3$$d$$ in Fe$$^{2+}$$ and Fe$$^{3+}$$ of LuFe$$_{2}$$O$$_{4}$$

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

no journal, , 

The charge-frustrated system Lu Fe$$_{2}$$O$$_{4}$$ is characterized by a regular arrangement of Fe$$^{2+}$$ and Fe$$^{3+}$$ ions on the frustrated triangle lattice and it had reported the charge order of Fe$$^{2+}$$ and Fe$$^{3+}$$ causes its ferroelectricity. In order to investigate the Fe 3$$d$$ state in the frustrated system, Fe La,b emission spectra and Fe L2,3 absorption spectra of LuFe$$_{2}$$+Fe$$_{3}$$+O$$_{4}$$, LuGaFe$$_{2}$$+O$$_{4}$$ and LuFe$$_{3}$$+CoO$$_{4}$$ at I511-3 at MAXLAB and 7.0.1 at ALS. It was found that the profile of Fe La,b emission spectra of LuFe$$^{2+}$$Fe$$^{3+}$$O$$_{4}$$ is not simple superposition of Fe$$^{2+}$$ and Fe$$^{3+}$$ electronic states.

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