Research on the ground state of electrons of an orbital-ordering perovskite Ti oxide by the X-ray magnetic diffraction experiment
| Project/Area Number |
16340098
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Gunma University |
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Principal Investigator |
ITO Masahisa Gunma University, Engineering, professor (90124362)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,800,000 (Direct Cost: ¥15,800,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2005: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2004: ¥12,200,000 (Direct Cost: ¥12,200,000)
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| Keywords | X-rav Magnetic Diffraction / X-rav Magnetic Scatterine / Soin Magnetic Form Factor / Orhital Maggnetic Form Fartor / Spin Density / Orbital Ordering / Perovskite Titanium Oxide / ペロブスカイト酸化物 / 強磁性体 / YTiO_3 |
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| Research Abstract |
Perovskite oxide YTiO_3 has peculiar solid-state properties; it shows orbital ordering and becomes ferromagnetic below 30K. Origin of the both properties is 3d electrons of Ti atoms. The aim of this research is to elucidate the peculiar properties of the perovskite titanium oxide YTiO_3 by using synchrotron radiation X-rays. We utilize two kinds of experimental methods, l) the X-ray magnetic diffraction (XMD) and 2) the magnetic Compton scattering (MCP), which are elastic and inelastic scattering of elliptically polarized synchrotron radiation X-rays by magnetic moments. Wavefunctions of magnetic electrons are observed in the reciprocal lattice space(or its Fourier transformed real space) by the former method, and in the momentum space by the latter method. Concrete purpose of this study is to clarify the ground state of the 3d electrons of Ti atoms in YTiO_3 through direct observation of the electrons orbital by synchrotron radiation.
We have upgraded the XMD experimental system in ord
… More
er to produce magnetic field of over 2T that is needed for saturating the magnetization even along the hard magnetization direction of this compound, as both experimental methods of XMD and MCP require the magnetization of the specimen to be saturated. By this upgrade of the experimental system we ca perform the XMD experiment under the condition in which the magnetization of the specimen crystal is saturated along any crystallographic direction.
We have obtained the following results from the XMD experiment.(1) We could measure spin magnetic form factor for all principal crystallographic axes of YTiO_3.(2) We have succeeded in obtaining three dimensional distribution of spin density of YTiO_3 in the real space for the first time.(3) The obtained spin density distribution was represented very well by the electron distribution of 3d-electons in the t2g state. This would be the first direct observation of a specific 3d electron orbital in the three dimensional real space. In the MCS experiment we could measure the magnetic Compton profile (MCP) of an orbital-ordering ferromagnetic compound for the first time. By comparing the observed MCP with the calculated MCP based on a model wavefunction we could determine the ground-state wavefunction of the 3d electron. In conclusion we could elucidate the ordered orbital (ground state wavefunction) of the 3d electrons of YTiO_3 in the real space and momentum space. Less
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Report
(4 results)
Research Products
(35 results)
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[Journal Article] Magnetic Compton Profile Study of orbital ordering state of 3d electrons in YTiO_32008
Author(s)
Naruki Tsuji, Masahisa Ito, Hiroshi Sakurai, Kosuke Suzuki, Kei Tanaka, Kensuke Kitani, Hiromichi Adachi, Hiroshi Kawata, Akihisa Koizumi, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Yoshinori Tokura
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Journal Title
Journal of the Physical Society of Japan Vol.77 No.2
NAID
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Study of the t_<2g> Orbital in the YTiO_3 by Using Magnetic Compton Profile Measurement2007
Author(s)
Naruki Tsuji, Masahisa Ito, Hiroshi Sakurai, KosukE Suzuki, Kei Tanaka, Hiromichi Adachi, Hiroshi Kawata, Akihisa Koizumi, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Yoshinori Tokura
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Journal Title
Photon Factory Activity Report #24 Part B
Pages: 78-78
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Observation of 3D Spin Density Distribution of Ferromagnetic YTiO_3 by X-Ray Magnetic Diffraction2007
Author(s)
Kosuke Suzuki, Masahisa Ito, Naruki Tsuji, Kensuke Kitani, Hiromichi Adachi, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Yoshinori Tokura, Eiji Nishibori, Makoto Sakata
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Journal Title
Photon Factory Activity Report #24 Part B
Pages: 82-82
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Study of the t_<2g> orbital in the YTiO_3 by using Magnetic Compton Profile Measurement2006
Author(s)
Naruki Tsuji, Masahisa Ito, Hirosi Sakurai, Kousuke Suzuki, Kensuke Kitani, Hiromichi Adachi, Hiroshi Kawata, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Akihiro Koizumi, Yoshinori Tokura
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Journal Title
Photon Factory Activity Report #23 part B
Pages: 92-92
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] MEM analysis of the spin magnetic form factor of YTiO_3 measured by X-ray magnetic diffraction2005
Author(s)
Naruki Tsuji, Masahisa Ito, Hiromitu Akiyama, Kousuke Suzuki, Hiromichi Aadachi, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Yoshinori Tokura, Eiji Nishibori, Makoto Sakata
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Journal Title
Photon Factory Activity Report #22 part B
Pages: 114-114
Description
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