Extended van-Hove singularity in Sr2RuO4 observed by angle-resolved photoemission

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

doi:10.1016/0921-4534(96)00073-1

Extended van-Hove singularity in Sr₂RuO₄ observed by angle-resolved photoemission

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

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

4 Citations (Scopus)

Abstract

We have performed low-temperature high-resolution angle-resolved photoemission spectroscopy on a non-cuprate superconductor Sr₂RuO₄ (T_c ∼ 1 K) which has the same crystal structure as La₂CuO₄ but with RuO₂ layers replacing CuO₂. We found that Sr₂RuO₄ has an extended van-Hove singularity (VHS) close to E_F(20 ± 2 meV) like high-T_c cuprates, regardless of the character of the electronic states at E_F, suggesting that the extended VHS is a general feature of a two-dimensional d-electron metal. This demands re-examination of the VHS scenario for the superconducting properties of cuprates, while T-linear resistivity seems to be consistent with this result.

Original language	English
Pages (from-to)	505-509
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	263
Issue number	1-4
DOIs	https://doi.org/10.1016/0921-4534(96)00073-1
Publication status	Published - May 1996
Externally published	Yes

ASJC Scopus subject areas

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

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title = "Extended van-Hove singularity in Sr2RuO4 observed by angle-resolved photoemission",

abstract = "We have performed low-temperature high-resolution angle-resolved photoemission spectroscopy on a non-cuprate superconductor Sr2RuO4 (Tc ∼ 1 K) which has the same crystal structure as La2CuO4 but with RuO2 layers replacing CuO2. We found that Sr2RuO4 has an extended van-Hove singularity (VHS) close to EF(20 ± 2 meV) like high-Tc cuprates, regardless of the character of the electronic states at EF, suggesting that the extended VHS is a general feature of a two-dimensional d-electron metal. This demands re-examination of the VHS scenario for the superconducting properties of cuprates, while T-linear resistivity seems to be consistent with this result.",

author = "T. Yokoya and A. Chainani and T. Takahashi and H. Katayama-Yoshida and M. Kasai and Y. Tokura",

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AU - Yokoya, T.

AU - Chainani, A.

AU - Takahashi, T.

AU - Katayama-Yoshida, H.

AU - Kasai, M.

AU - Tokura, Y.

PY - 1996/5

Y1 - 1996/5

N2 - We have performed low-temperature high-resolution angle-resolved photoemission spectroscopy on a non-cuprate superconductor Sr2RuO4 (Tc ∼ 1 K) which has the same crystal structure as La2CuO4 but with RuO2 layers replacing CuO2. We found that Sr2RuO4 has an extended van-Hove singularity (VHS) close to EF(20 ± 2 meV) like high-Tc cuprates, regardless of the character of the electronic states at EF, suggesting that the extended VHS is a general feature of a two-dimensional d-electron metal. This demands re-examination of the VHS scenario for the superconducting properties of cuprates, while T-linear resistivity seems to be consistent with this result.

AB - We have performed low-temperature high-resolution angle-resolved photoemission spectroscopy on a non-cuprate superconductor Sr2RuO4 (Tc ∼ 1 K) which has the same crystal structure as La2CuO4 but with RuO2 layers replacing CuO2. We found that Sr2RuO4 has an extended van-Hove singularity (VHS) close to EF(20 ± 2 meV) like high-Tc cuprates, regardless of the character of the electronic states at EF, suggesting that the extended VHS is a general feature of a two-dimensional d-electron metal. This demands re-examination of the VHS scenario for the superconducting properties of cuprates, while T-linear resistivity seems to be consistent with this result.

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