Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4

Takashi Takahashi, T. Yokoya, A. Chainani, H. Katayama-Yoshida, M. Kasai, Y. Tokura

Research output: Contribution to journalConference article

Abstract

Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a non-cuprate superconductor Sr 2RuO 4 (T c approximately 1 K), which has the same crystal structure as La 2CuO 4, but with RuO 2 layers replacing CuO 2. High-resolution ARPES spectra obtained along Γ - Z line (Ru-O bonding direction) in Brillouin zone show the existence of an extended van-Hove singularity (VHS) close to E F (20 plus or minus 2 meV) like high-T c cuprates, regardless of the character of the electronic states at E F, suggesting that an extended VHS is a general feature of correlated two-dimensional d - electron metals. This requests re-examination of the VHS scenario for superconducting properties of cuprates, while the observed T-linear resistivity seems to be consistent with the present result.

Original languageEnglish
Pages (from-to)507-512
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2696
Issue number2/-
Publication statusPublished - 1996 Dec 1
EventSpectroscopic Studies of Superconductors. Part 2 (of 2) - San Jose, CA, USA
Duration: 1996 Jan 291996 Feb 1

Fingerprint

Perovskite
Superconductor
Photoelectron spectroscopy
trucks
Superconducting materials
Singularity
cuprates
Spectroscopy
Electronic states
photoelectric emission
High Resolution
Angle
Crystal structure
Metals
high resolution
Crystal Structure
Resistivity
Brillouin zones
spectroscopy
Electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Takahashi, Takashi ; Yokoya, T. ; Chainani, A. ; Katayama-Yoshida, H. ; Kasai, M. ; Tokura, Y. / Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4. In: Proceedings of SPIE - The International Society for Optical Engineering. 1996 ; Vol. 2696 , No. 2/-. pp. 507-512.
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Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4. / Takahashi, Takashi; Yokoya, T.; Chainani, A.; Katayama-Yoshida, H.; Kasai, M.; Tokura, Y.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 2696 , No. 2/-, 01.12.1996, p. 507-512.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4

AU - Takahashi, Takashi

AU - Yokoya, T.

AU - Chainani, A.

AU - Katayama-Yoshida, H.

AU - Kasai, M.

AU - Tokura, Y.

PY - 1996/12/1

Y1 - 1996/12/1

N2 - Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a non-cuprate superconductor Sr 2RuO 4 (T c approximately 1 K), which has the same crystal structure as La 2CuO 4, but with RuO 2 layers replacing CuO 2. High-resolution ARPES spectra obtained along Γ - Z line (Ru-O bonding direction) in Brillouin zone show the existence of an extended van-Hove singularity (VHS) close to E F (20 plus or minus 2 meV) like high-T c cuprates, regardless of the character of the electronic states at E F, suggesting that an extended VHS is a general feature of correlated two-dimensional d - electron metals. This requests re-examination of the VHS scenario for superconducting properties of cuprates, while the observed T-linear resistivity seems to be consistent with the present result.

AB - Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a non-cuprate superconductor Sr 2RuO 4 (T c approximately 1 K), which has the same crystal structure as La 2CuO 4, but with RuO 2 layers replacing CuO 2. High-resolution ARPES spectra obtained along Γ - Z line (Ru-O bonding direction) in Brillouin zone show the existence of an extended van-Hove singularity (VHS) close to E F (20 plus or minus 2 meV) like high-T c cuprates, regardless of the character of the electronic states at E F, suggesting that an extended VHS is a general feature of correlated two-dimensional d - electron metals. This requests re-examination of the VHS scenario for superconducting properties of cuprates, while the observed T-linear resistivity seems to be consistent with the present result.

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