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High-resolution photoemission study of FeSr2YCu2O7+δ |
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| Authors: | H MatsuiT Sato S NishinaT Takahashi Y MiharaY Hata K KadowakiT Mochiku |
| Affiliation: | a Department of Physics, Tohoku University, Sendai 908-8578, Japan b Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-3573, Japan c Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan d National Institute for Metals, Tsukuba, Ibaraki 305, Japan |
| Abstract: | We have performed high-resolution photoemission spectroscopy (PES) on FeSr2YCu2O7+δ, of which superconductivity of Tc=49 K 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. |
| Keywords: | A. Superconductors C. Photoelectron spectroscopy D. Electronic structure |
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