TY - JOUR
T1 - High-resolution photoemission study of FeSr2YCu2O7+δ
AU - Matsui, H.
AU - Sato, T.
AU - Nishina, S.
AU - Takahashi, T.
AU - Mihara, Y.
AU - Hata, Y.
AU - Kadowaki, K.
AU - Mochiku, T.
N1 - Funding Information:
This work was supported by grants from the Sasakawa Scientific Research Grant from the Japan Science Society and the MEXT of Japan. TS thanks the Japan Society for Promotion of Science for financial support.
PY - 2002/12
Y1 - 2002/12
N2 - We have performed high-resolution photoemission spectroscopy (PES) on FeSr2YCu2O7+δ, of which superconductivity of Tc=49K was recently reported. We clearly observed opening of a d-wave-like superconducting gap and estimated the maximum gap value (Δmax) to be 10 meV at 15 K. This gap value gives 2Δmax/kBTc ∼ 5, suggesting a strong-coupling nature of superconductivity in FeSr2YCu2O7+δ. Comparative PES study with superconducting and insulating samples shows that the valence band is rigidly shifted as a function of doping without evolution of additional states within the insulating gap.
AB - We have performed high-resolution photoemission spectroscopy (PES) on FeSr2YCu2O7+δ, of which superconductivity of Tc=49K was recently reported. We clearly observed opening of a d-wave-like superconducting gap and estimated the maximum gap value (Δmax) to be 10 meV at 15 K. This gap value gives 2Δmax/kBTc ∼ 5, suggesting a strong-coupling nature of superconductivity in FeSr2YCu2O7+δ. Comparative PES study with superconducting and insulating samples shows that the valence band is rigidly shifted as a function of doping without evolution of additional states within the insulating gap.
KW - A. Superconductors
KW - C. Photoelectron spectroscopy
KW - D. Electronic structure
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U2 - 10.1016/S0022-3697(02)00226-3
DO - 10.1016/S0022-3697(02)00226-3
M3 - Conference article
AN - SCOPUS:0036903125
SN - 0022-3697
VL - 63
SP - 2329
EP - 2332
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 12
T2 - SNS 2001
Y2 - 13 May 2001 through 17 May 2002
ER -