Photoemission study of the superconducting-gap symmetry in electron-doped high-Tc superconductors

H. Matsui; T. Sato; T. Takahashi; K. Nakayama; K. Terashima; M. Fujita; K. Yamada

doi:10.1016/j.physc.2007.03.155

Photoemission study of the superconducting-gap symmetry in electron-doped high-T_c superconductors

H. Matsui, T. Sato, T. Takahashi, K. Nakayama, K. Terashima, M. Fujita, K. Yamada

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

To study the superconducting-gap symmetry in electron-doped HTSC, we performed a high-resolution ARPES on Pr_0.89LaCe_0.11CuO₄ (optimally-doped, T_c = 26 K). Obtained momentum dependence of the superconducting gap is basically consistent with the d_{x2 - y2}-wave symmetry, but obviously deviates from the monotonic form of the d_{x2 - y2} gap function. The maximum superconducting gap is not located at the zone boundary as expected from a simple d_{x2 - y2}-wave, but observed at the so-called hot spot where the antiferromagnetic spin fluctuation strongly couples to the electrons on the Fermi surface. This ARPES result suggests that the spin-correlation plays an essential role in the pairing mechanism of electron-doped HTSC.

Original language	English
Pages (from-to)	862-863
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	460-462 II
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2007.03.155
Publication status	Published - Sept 1 2007
Externally published	Yes

Keywords

Angle-resolved photoemission
Electron-doped cuprates
Superconducting gap

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2007.03.155

Cite this

@article{fd98adf390f3470589b702a5b546048d,

title = "Photoemission study of the superconducting-gap symmetry in electron-doped high-Tc superconductors",

abstract = "To study the superconducting-gap symmetry in electron-doped HTSC, we performed a high-resolution ARPES on Pr0.89LaCe0.11CuO4 (optimally-doped, Tc = 26 K). Obtained momentum dependence of the superconducting gap is basically consistent with the dx2 - y2-wave symmetry, but obviously deviates from the monotonic form of the dx2 - y2 gap function. The maximum superconducting gap is not located at the zone boundary as expected from a simple dx2 - y2-wave, but observed at the so-called hot spot where the antiferromagnetic spin fluctuation strongly couples to the electrons on the Fermi surface. This ARPES result suggests that the spin-correlation plays an essential role in the pairing mechanism of electron-doped HTSC.",

keywords = "Angle-resolved photoemission, Electron-doped cuprates, Superconducting gap",

author = "H. Matsui and T. Sato and T. Takahashi and K. Nakayama and K. Terashima and M. Fujita and K. Yamada",

note = "Funding Information: This work was supported by a grant from the MEXT of Japan and JST-CREST. H.M. thanks the financial support from JSPS.",

year = "2007",

month = sep,

day = "1",

doi = "10.1016/j.physc.2007.03.155",

language = "English",

volume = "460-462 II",

pages = "862--863",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "SPEC. ISS.",

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TY - JOUR

T1 - Photoemission study of the superconducting-gap symmetry in electron-doped high-Tc superconductors

AU - Matsui, H.

AU - Sato, T.

AU - Takahashi, T.

AU - Nakayama, K.

AU - Terashima, K.

AU - Fujita, M.

AU - Yamada, K.

N1 - Funding Information: This work was supported by a grant from the MEXT of Japan and JST-CREST. H.M. thanks the financial support from JSPS.

PY - 2007/9/1

Y1 - 2007/9/1

N2 - To study the superconducting-gap symmetry in electron-doped HTSC, we performed a high-resolution ARPES on Pr0.89LaCe0.11CuO4 (optimally-doped, Tc = 26 K). Obtained momentum dependence of the superconducting gap is basically consistent with the dx2 - y2-wave symmetry, but obviously deviates from the monotonic form of the dx2 - y2 gap function. The maximum superconducting gap is not located at the zone boundary as expected from a simple dx2 - y2-wave, but observed at the so-called hot spot where the antiferromagnetic spin fluctuation strongly couples to the electrons on the Fermi surface. This ARPES result suggests that the spin-correlation plays an essential role in the pairing mechanism of electron-doped HTSC.

AB - To study the superconducting-gap symmetry in electron-doped HTSC, we performed a high-resolution ARPES on Pr0.89LaCe0.11CuO4 (optimally-doped, Tc = 26 K). Obtained momentum dependence of the superconducting gap is basically consistent with the dx2 - y2-wave symmetry, but obviously deviates from the monotonic form of the dx2 - y2 gap function. The maximum superconducting gap is not located at the zone boundary as expected from a simple dx2 - y2-wave, but observed at the so-called hot spot where the antiferromagnetic spin fluctuation strongly couples to the electrons on the Fermi surface. This ARPES result suggests that the spin-correlation plays an essential role in the pairing mechanism of electron-doped HTSC.

KW - Angle-resolved photoemission

KW - Electron-doped cuprates

KW - Superconducting gap

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