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Gap inhomogeneity in High-Tc cuprate superconductor studied by high resolution micro-ARPES

https://repo.qst.go.jp/records/85589
https://repo.qst.go.jp/records/85589
c9210c07-3a38-4ee3-a0e9-5842651571b6
Item type 会議発表用資料 / Presentation(1)
公開日 2022-03-22
タイトル
タイトル Gap inhomogeneity in High-Tc cuprate superconductor studied by high resolution micro-ARPES
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_c94f
資源タイプ conference object
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 Sugiyama, T.

× Sugiyama, T.

WEKO 1030605

Sugiyama, T.

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Hideaki, Iwasawa

× Hideaki, Iwasawa

WEKO 1030606

Hideaki, Iwasawa

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Ozawa, S.

× Ozawa, S.

WEKO 1030607

Ozawa, S.

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Oda, H.

× Oda, H.

WEKO 1030608

Oda, H.

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Kono, T.

× Kono, T.

WEKO 1030609

Kono, T.

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Okuda, T.

× Okuda, T.

WEKO 1030610

Okuda, T.

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Miyamoto, K.

× Miyamoto, K.

WEKO 1030611

Miyamoto, K.

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Ishida, S.

× Ishida, S.

WEKO 1030612

Ishida, S.

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Yoshida, Y.

× Yoshida, Y.

WEKO 1030613

Yoshida, Y.

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Eisaki , H.

× Eisaki , H.

WEKO 1030614

Eisaki , H.

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Kimura, A.

× Kimura, A.

WEKO 1030615

Kimura, A.

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Hideaki, Iwasawa

× Hideaki, Iwasawa

WEKO 1030616

en Hideaki, Iwasawa

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抄録
内容記述タイプ Abstract
内容記述 The mechanism of the high-Tc superconductivity has not been clarified yet. The order parameter, the superconducting gap, of the high-Tc superconductivity has been extensively investigated. Angle-resolved photoemission spectroscopy (ARPES) is known as the powerful tool to prove the superconducting gap in a momentum-resolved manner, enabled fingerprinting the d-wave gap symmetry in cuprate superconductors. On the other hand, scanning tunneling spectroscopy/microscopy allows to observe the superconducting gap, and the nano-scale inhomogeneity in the real-space was reported in Bi2Sr2CaCu2O8+δ (Bi2212) [1]. However, such real-space inhomogeneity has not been fully considered in the conventional ARPES studies due to its low spatial resolution (~ mm-order scale). To overcome this problem and study the evolution of the superconducting gap in the real- and momentum-space, we have performed high-resolution micro-ARPES experiments on underdoped Bi2212 (Tc = 65 K) using a micro-focused laser (hν = 6 eV) at the Hiroshima Synchrotron Radiation Center, Hiroshima University [2]. Figure 1 shows the ARPES image of the underdoped Bi2212 taken along the nodal direction (red line in the inset) in the superconducting state (T = 20 K). We have then measured such a clear band dispersion from the nodal to the off-nodal direction (blue line in the inset) and evaluated the momentum dependence of the gap. In addition, we have also examined the real-space dependence of the superconducting gap by performing the same measurement while slightly changing the measurement position on the sample surface. We found that the gap magnitude and its momentum dependence are clearly different in spite of the small difference (less than 0.1 mm) on the measurement position. In this talk, we will discuss the observed real-space and momentum-space dependence on the superconducting gap and the pseudogap in detail.
[1] K. McElroy et al., Phys. Rev. Lett. 94, 197005 (2005).
[2] H. Iwasawa et al., Ultramicroscopy 182, 85-91, (2017).
会議概要(会議名, 開催地, 会期, 主催者等)
内容記述タイプ Other
内容記述 The 9th International Symposium on Surface Science
発表年月日
日付 2021-11-30
日付タイプ Issued
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