@article{oai:kyutech.repo.nii.ac.jp:00006205,
 author = {Tanaka, Masashi and 田中, 将嗣 and Nagao,  Masanori and Matsumoto,  Ryo and Kataoka,  Noriyuki and Ueta,  Ikuo and Tanaka,  Hiromi and Watauchi,  Satoshi and Tanaka,  Isao and Takano,  Yoshihiko},
 issue = {25},
 journal = {Journal of Alloys and Compounds},
 month = {Jun},
 note = {“F-free” CeOBiS2 single crystals have successfully grown, thoroughly eliminating a concern about F-contamination by using a high-purity CsCl flux. The obtained crystals have a plate-like shape with a size of 1.0–3.0 mm in the well-developed plane. Single crystal X-ray structural analysis clearly revealed that the CeOBiS2 crystallizes with a space group P4/nmm (with lattice parameters of a = 4.0189 (6) Å, c = 13.573 (2) Å). The bond valence sum estimation and X-ray photoelectron spectroscopy analysis showed that the chemical state of Ce was in the mixed valence of Ce3+ and Ce4+. The single crystals show superconductivity with zero resistivity at ∼1.3 K. This is the first conclusive evidence of superconductivity driven by Ce valence fluctuation in surely non-doped CeOBiS2. The superconducting transition temperature was enhanced up to ∼3.8 K by applying hydrostatic pressure.},
 pages = {467--473},
 title = {Superconductivity and its enhancement under high pressure in “F-free” single crystals of CeOBiS2},
 volume = {722},
 year = {2017},
 yomi = {タナカ, マサシ}
}