Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr2RuO4

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

doi:10.1117/12.241781

10 June 1996 Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr₂RuO₄

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

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241781
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Low-temperature high-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a non-cuprate superconductor Sr₂RuO₄ (T_c approximately 1 K), which has the same crystal structure as La₂CuO₄, but with RuO₂ layers replacing CuO₂. High-resolution ARPES spectra obtained along (Gamma) - 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.

Citation Download Citation

Takashi Takahashi, T. Yokoya, A. Chainani, H. Katayama-Yoshida, M. Kasai, and Yoshinori Tokura "Extended van Hove singularity in noncuprate-layered perovskite superconductor Sr₂RuO₄", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241781

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