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
Y1 - 1996
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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M3 - Conference article
AN - SCOPUS:0030394009
SN - 0277-786X
VL - 2696
SP - 507
EP - 512
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
IS - 2/-
T2 - Spectroscopic Studies of Superconductors. Part 2 (of 2)
Y2 - 29 January 1996 through 1 February 1996
ER -