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  1. 原著論文

Emergence of low-energy electronic states in oxygen-controlled Mott insulator Ca2RuO4+δ

https://repo.qst.go.jp/records/81634
https://repo.qst.go.jp/records/81634
e14e3195-7f60-49ec-8126-a615c4a9afd7
Item type 学術雑誌論文 / Journal Article(1)
公開日 2021-01-12
タイトル
タイトル Emergence of low-energy electronic states in oxygen-controlled Mott insulator Ca2RuO4+δ
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
アクセス権
アクセス権 metadata only access
アクセス権URI http://purl.org/coar/access_right/c_14cb
著者 Miyashita, Takeo

× Miyashita, Takeo

WEKO 1016399

Miyashita, Takeo

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Iwasawa, Hideaki

× Iwasawa, Hideaki

WEKO 1016400

Iwasawa, Hideaki

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Yoshikawa, Tomoki

× Yoshikawa, Tomoki

WEKO 1016401

Yoshikawa, Tomoki

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Ozawa, Shusuke

× Ozawa, Shusuke

WEKO 1016402

Ozawa, Shusuke

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Oda, Hironoshin

× Oda, Hironoshin

WEKO 1016403

Oda, Hironoshin

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Muro, Takayuki

× Muro, Takayuki

WEKO 1016404

Muro, Takayuki

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Ogura, Hiroki

× Ogura, Hiroki

WEKO 1016405

Ogura, Hiroki

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Sakami, Tatsuhiro

× Sakami, Tatsuhiro

WEKO 1016406

Sakami, Tatsuhiro

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Nakamura, Fumihiko

× Nakamura, Fumihiko

WEKO 1016407

Nakamura, Fumihiko

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Ino, Akihiro

× Ino, Akihiro

WEKO 1016408

Ino, Akihiro

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Hideaki, Iwasawa

× Hideaki, Iwasawa

WEKO 1016409

en Hideaki, Iwasawa

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抄録
内容記述タイプ Abstract
内容記述 Insulator-to-metal transition in Ca2RuO4 has drawn keen attention because of its sensitivity to various stimulation and its potential controllability. Here, we report a direct observation of Fermi surface, which emerges upon introducing excess oxygen into an insulating Ca2RuO4, by using angle-resolved photoemission spectroscopy. Comparison between energy distribution curves shows that the Mott insulating gap is closed by eV-scale spectral-weight transfer with excess oxygen. Momentum-space mapping exhibits two square-shaped sheets of the Fermi surface. One is a hole-like ???? sheet around the corner of a tetragonal Brillouin zone, and the other is an electron-like ???? sheet around the Γ point. The electron occupancies of the ???? and ???? bands are determined to be ???????? = 1.6 and ???????? = 0.6, respectively. Our result indicates that the insulator-to-metal transition occurs selectively in ???????????? and ???????????? bands and not yet in ???????????? band. This orbital selectivity is most likely explained in terms of the energy level of ????????????, which is deeper for Ca2RuO4+???? than for Ca1.8Sr0.2RuO4. Consequently, we found substantial differences from the Fermi surface of other ruthenates, shedding light on a unique role of excess oxygen among the metallization methods of Ca2RuO4.
書誌情報 Solid State Communications

巻 326, p. 114180, 発行日 2021-01
ISSN
収録物識別子タイプ ISSN
収録物識別子 0038-1098
DOI
識別子タイプ DOI
関連識別子 10.1016/j.ssc.2020.114180
関連サイト
識別子タイプ URI
関連識別子 https://www.sciencedirect.com/science/article/pii/S0038109820306724
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