2017 Fiscal Year Final Research Report
Spin-orbit coupled electronic structures studied by bulk-sensitive angle-resolved photoemission spectroscopy
| Project/Area Number |
15K05186
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Konan University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SEKIYAMA AKIRA 大阪大学, 大学院基礎工学研究科, 教授 (40294160)
TAKASE KOICHI 日本大学, 理工学部, 教授 (10297781)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 電子構造 / 光電子分光 / イリジウム / 酸化物 / スピン軌道 |
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| Outline of Final Research Achievements |
In this study, we systematically investigate three-dimensional momentum-resolved electronic structures of Ruddlesden-Popper-type iridium oxides Srn+1IrnO3n+1 using soft-x-ray angle-resolved photoemission spectroscopy. Our results provide direct evidence of an insulator-to-metal transition that occurs upon increasing the dimensionality of the IrO2-plane structure. This transition occurs when the spin-orbit-coupled jeff = 1/2 band changes its behavior in the dispersion relation and moves across the Fermi energy. In addition, an emerging band along the G(0,0,0)-R(π,π,π) direction is found to play a crucial role in the metallic characteristics of SrIrO3. In addition, Sr3Ir2O7 solely showed the transition in conjunction with the magnetic phase transition induced by temperature change.
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| Free Research Field |
固体物理学，光物性
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