*Takanori Wakita1, Eugenio Paris2, Kaya Kobayashi1, Kensei Terashima1, Muammer Yasin Hacisalihoglu3, Teppei Ueno1, Federica Bondino4, Elena Magnano4,6, Igor Pis4,5, Luca Olivi5, Jun Akimitsu1, Yuji Muraoka1, Takayoshi Yokoya1, Naurang L. Saini2
(1. Okayama University(Japan), 2. Sapienza Universita di Roma(Italy), 3. Recep Tayyip Erdogan University(Turkey), 4. IOM-CNR(Italy), 5. Elettra-Sincrotrone Trieste(Italy), 6. University of Johannesburg(South Africa))
キーワード:Negative U superconductor, Valence skipper, X-ray photoemission spectroscopy, X-ray absorption spectroscopy, Extended X-ray absorption fine structure