High-resolution ARPES study of quasi-particles in high-T c superconductors

T. Takahashi, T. Sato, H. Matsui, Kensei Terashima

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have performed systematic and comprehensive high-resolution angle-resolved photoemission (ARPES) measurements on Bi-system high-T c superconductors to study the quasi-particles related to and/or responsible for the occurrence of the superconductivity. We have experimentally determined the full energy dispersion and the coherence factors of the Bogoliubov quasi-particles, which show a good quantitative agreement with the prediction from the BCS theory. This proves the basic validity of the BCS theory in the broad sense to describe the high-T c superconductivity. We have experimentally identified two different bosonic modes in Bi-system high-T c superconductors. One produces a 'small' kink in the limited momentum region around the nodal cut and another is related to a 'large' kink which exists in a relatively wide momentum region with the stronger magnitude closer to the (π, 0) point. The observed momentum and temperature dependence of the kinks as well as the impurity effect show that the large kink is of magnetic origin and closely related to the high-T c superconductivity.

Original languageEnglish
Article number105
JournalNew Journal of Physics
Volume7
DOIs
Publication statusPublished - Apr 29 2005
Externally publishedYes

Fingerprint

elementary excitations
BCS theory
photoelectric emission
superconductivity
momentum
high resolution
occurrences
impurities
temperature dependence
predictions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

High-resolution ARPES study of quasi-particles in high-T c superconductors. / Takahashi, T.; Sato, T.; Matsui, H.; Terashima, Kensei.

In: New Journal of Physics, Vol. 7, 105, 29.04.2005.

Research output: Contribution to journalArticle

Takahashi, T. ; Sato, T. ; Matsui, H. ; Terashima, Kensei. / High-resolution ARPES study of quasi-particles in high-T c superconductors. In: New Journal of Physics. 2005 ; Vol. 7.
@article{4ee7dfd140534a90b5182d3fd5449649,
title = "High-resolution ARPES study of quasi-particles in high-T c superconductors",
abstract = "We have performed systematic and comprehensive high-resolution angle-resolved photoemission (ARPES) measurements on Bi-system high-T c superconductors to study the quasi-particles related to and/or responsible for the occurrence of the superconductivity. We have experimentally determined the full energy dispersion and the coherence factors of the Bogoliubov quasi-particles, which show a good quantitative agreement with the prediction from the BCS theory. This proves the basic validity of the BCS theory in the broad sense to describe the high-T c superconductivity. We have experimentally identified two different bosonic modes in Bi-system high-T c superconductors. One produces a 'small' kink in the limited momentum region around the nodal cut and another is related to a 'large' kink which exists in a relatively wide momentum region with the stronger magnitude closer to the (π, 0) point. The observed momentum and temperature dependence of the kinks as well as the impurity effect show that the large kink is of magnetic origin and closely related to the high-T c superconductivity.",
author = "T. Takahashi and T. Sato and H. Matsui and Kensei Terashima",
year = "2005",
month = "4",
day = "29",
doi = "10.1088/1367-2630/7/1/105",
language = "English",
volume = "7",
journal = "New Journal of Physics",
issn = "1367-2630",
publisher = "IOP Publishing Ltd.",

}

TY - JOUR

T1 - High-resolution ARPES study of quasi-particles in high-T c superconductors

AU - Takahashi, T.

AU - Sato, T.

AU - Matsui, H.

AU - Terashima, Kensei

PY - 2005/4/29

Y1 - 2005/4/29

N2 - We have performed systematic and comprehensive high-resolution angle-resolved photoemission (ARPES) measurements on Bi-system high-T c superconductors to study the quasi-particles related to and/or responsible for the occurrence of the superconductivity. We have experimentally determined the full energy dispersion and the coherence factors of the Bogoliubov quasi-particles, which show a good quantitative agreement with the prediction from the BCS theory. This proves the basic validity of the BCS theory in the broad sense to describe the high-T c superconductivity. We have experimentally identified two different bosonic modes in Bi-system high-T c superconductors. One produces a 'small' kink in the limited momentum region around the nodal cut and another is related to a 'large' kink which exists in a relatively wide momentum region with the stronger magnitude closer to the (π, 0) point. The observed momentum and temperature dependence of the kinks as well as the impurity effect show that the large kink is of magnetic origin and closely related to the high-T c superconductivity.

AB - We have performed systematic and comprehensive high-resolution angle-resolved photoemission (ARPES) measurements on Bi-system high-T c superconductors to study the quasi-particles related to and/or responsible for the occurrence of the superconductivity. We have experimentally determined the full energy dispersion and the coherence factors of the Bogoliubov quasi-particles, which show a good quantitative agreement with the prediction from the BCS theory. This proves the basic validity of the BCS theory in the broad sense to describe the high-T c superconductivity. We have experimentally identified two different bosonic modes in Bi-system high-T c superconductors. One produces a 'small' kink in the limited momentum region around the nodal cut and another is related to a 'large' kink which exists in a relatively wide momentum region with the stronger magnitude closer to the (π, 0) point. The observed momentum and temperature dependence of the kinks as well as the impurity effect show that the large kink is of magnetic origin and closely related to the high-T c superconductivity.

UR - http://www.scopus.com/inward/record.url?scp=21244471520&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=21244471520&partnerID=8YFLogxK

U2 - 10.1088/1367-2630/7/1/105

DO - 10.1088/1367-2630/7/1/105

M3 - Article

AN - SCOPUS:21244471520

VL - 7

JO - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

M1 - 105

ER -