表面と真空
Online ISSN : 2433-5843
Print ISSN : 2433-5835
特集「放射光で観る最先端材料と物性」
遷移金属化合物の軌道秩序相のドメイン分解nano-ARPES
溝川 貴司
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2022 年 65 巻 5 号 p. 224-229

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Angle-resolved photoemission spectromicroscopy with submicron resolution (nano-ARPES) is a powerful technique to study electronic structure of microcrystals and microdomains. Transition-metal compounds such as FeTe and IrTe2 exhibit unique phase transitions due to orbital symmetry breaking (orbital order). In nano-ARPES studies on FeTe and IrTe2 surface, we observed interesting domain textures which would be related to their microscopic orbital orders. The antiferromagnetic phase of FeTe hosts stripe-type domains driven by its anisotropic electronic state. In case of IrTe2, each domain harbors quasi one-dimensional surface bands forming fragmented Fermi surfaces (Fermi arcs). The nano-ARPES measurement enabled us to identify the unique domain dependent surface states in the orbital ordered phase of IrTe2.

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この記事はクリエイティブ・コモンズ [表示 - 非営利 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc/4.0/deed.ja
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