Single-particle excitation gap in La2-xSrxCuO4 studied by high-resolution angle-resolved photoemission

Y. X. Xiao; T. Sato; K. Terashima; H. Matsui; T. Takahashi; M. Kofu; K. Hirota

doi:10.1016/j.physc.2007.03.434

Single-particle excitation gap in La_2-xSr_xCuO₄ studied by high-resolution angle-resolved photoemission

Y. X. Xiao, T. Sato, K. Terashima, H. Matsui, T. Takahashi, M. Kofu, K. Hirota

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

Abstract

We report angle-resolved photoemission spectroscopy on optimally doped high-T_c superconductor La_1.85Sr_0.15CuO₄ (T_c = 37 K) to elucidate the character of low-energy excitations in the superconducting state. We find a clear evidence for the emergence of a sharp superconducting quasiparticle peak below T_c together with opening of a superconducting gap at off-nodal region, while no signature of a quasiparticle peak is observed at (π, 0). From the comparison of spectral lineshape and energy dispersion between the nodal and the off-nodal region, we conclude that there are two characteristic energy scales (70 and 20 meV) in the superconducting state of optimally doped La_1.85Sr_0.15CuO₄.

Original language	English
Pages (from-to)	44-47
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	463-465
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/j.physc.2007.03.434
Publication status	Published - 2007 Oct 1

Keywords

ARPES
Electronic structure
High-T superconductor

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.2007.03.434

Cite this

@article{bb1d21d03fc04670892038a619bddfa1,

title = "Single-particle excitation gap in La2-xSrxCuO4 studied by high-resolution angle-resolved photoemission",

abstract = "We report angle-resolved photoemission spectroscopy on optimally doped high-Tc superconductor La1.85Sr0.15CuO4 (Tc = 37 K) to elucidate the character of low-energy excitations in the superconducting state. We find a clear evidence for the emergence of a sharp superconducting quasiparticle peak below Tc together with opening of a superconducting gap at off-nodal region, while no signature of a quasiparticle peak is observed at (π, 0). From the comparison of spectral lineshape and energy dispersion between the nodal and the off-nodal region, we conclude that there are two characteristic energy scales (70 and 20 meV) in the superconducting state of optimally doped La1.85Sr0.15CuO4.",

keywords = "ARPES, Electronic structure, High-T superconductor",

author = "Xiao, {Y. X.} and T. Sato and K. Terashima and H. Matsui and T. Takahashi and M. Kofu and K. Hirota",

note = "Funding Information: This work is supported by JST-CREST and MEXT of Japan. K.T. thanks JSPS for financial support.",

year = "2007",

month = oct,

day = "1",

doi = "10.1016/j.physc.2007.03.434",

language = "English",

volume = "463-465",

pages = "44--47",

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

issn = "0921-4534",

publisher = "Elsevier",

number = "SUPPL.",

}

TY - JOUR

T1 - Single-particle excitation gap in La2-xSrxCuO4 studied by high-resolution angle-resolved photoemission

AU - Xiao, Y. X.

AU - Sato, T.

AU - Terashima, K.

AU - Matsui, H.

AU - Takahashi, T.

AU - Kofu, M.

AU - Hirota, K.

N1 - Funding Information: This work is supported by JST-CREST and MEXT of Japan. K.T. thanks JSPS for financial support.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - We report angle-resolved photoemission spectroscopy on optimally doped high-Tc superconductor La1.85Sr0.15CuO4 (Tc = 37 K) to elucidate the character of low-energy excitations in the superconducting state. We find a clear evidence for the emergence of a sharp superconducting quasiparticle peak below Tc together with opening of a superconducting gap at off-nodal region, while no signature of a quasiparticle peak is observed at (π, 0). From the comparison of spectral lineshape and energy dispersion between the nodal and the off-nodal region, we conclude that there are two characteristic energy scales (70 and 20 meV) in the superconducting state of optimally doped La1.85Sr0.15CuO4.

AB - We report angle-resolved photoemission spectroscopy on optimally doped high-Tc superconductor La1.85Sr0.15CuO4 (Tc = 37 K) to elucidate the character of low-energy excitations in the superconducting state. We find a clear evidence for the emergence of a sharp superconducting quasiparticle peak below Tc together with opening of a superconducting gap at off-nodal region, while no signature of a quasiparticle peak is observed at (π, 0). From the comparison of spectral lineshape and energy dispersion between the nodal and the off-nodal region, we conclude that there are two characteristic energy scales (70 and 20 meV) in the superconducting state of optimally doped La1.85Sr0.15CuO4.

KW - ARPES

KW - Electronic structure

KW - High-T superconductor

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U2 - 10.1016/j.physc.2007.03.434

DO - 10.1016/j.physc.2007.03.434

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VL - 463-465

SP - 44

EP - 47

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

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