In order to clarify the intrinsic bulk electronic structure of strongly-correlated electron systems, we have realized hard X-ray photoemission spectroscopy with high energy-resolution at BL29XUL in SPring-8. The total energy resolution of 75 meV was achieved at the excitation energy of 5.95 keV. Large probing depth of about 100 Å enables us to probe intrinsic bulk electronic structure free from surface condition. The importance and capability of this technique are demonstrated by the drastic difference in the Cu 2p core-level spectra of Nd1.85 Ce0.15 CuO4 crystals obtained using soft and hard X-rays.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering