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Superconductivity and phase instability of NH3-free Na-intercalated FeSe1-zSz
Jiangang Guo, Hechang Lei, Fumitaka Hayashi +1
The discovery of ThCr2Si2-type AxFe2-ySe2 (A = K, Rb, Cs and Tl) with Tc ~ 30K make much progress in iron-based superconducting field, but their multiple-phase separations are disa…
Crossover between magnetism and superconductivity in low H-doped LaFeAsO
G. Lamura, T. Shiroka, P. Bonfa' +7
By a systematic study of the hydrogen-doped LaFeAsO system by means of dc resistivity, dc magnetometry, and muon-spin spectroscopy we addressed the question of universality of the…
Emergence of magnetism and controlling factors of superconductivity in Li/Na-ammonia co-intercalated FeSe1-zTez
Hechang Lei, Jiangang Guo, Fumitaka Hayashi +1
The discovery of superconductivity in alkali-ammonia co-intercalated FeSe has generated intensive interest because of their highest Tc (~ 45 K) among iron-chalcogenide superconduct…
Hydrogen Ordering and New Polymorph of Layered Perovskite Oxyhydrides: Sr2VO4-xHx
Joonho Bang, Satoru Matsuishi, Haruhiro Hiraka +7
Compositionally tunable vanadium oxyhydrides Sr2VO4-xHx (x = 0 - 1) without considerable anion vacancy were synthesized by high-pressure solid state reaction. The crystal structure…
Layered Compounds BaM2Ge4Ch6 (M = Rh, Ir and Ch = S, Se) with Pyrite-Type Building Blocks and Ge-Ch Heteromolecule-Like Anions
Hechang Lei, Jun-ichi Yamaura, Jiangang Guo +3
Structure and chemical features of layered compounds BaM2Ge4Ch6 (M = Rh, Ir; Ch = S, Se) synthesized under high-pressure and high-temperature method are systematically studied. The…
Critical factor for epitaxial growth of cobalt-doped BaFe2As2 films by pulsed laser deposition
Hidenori Hiramatsu, Hikaru Sato, Takayoshi Katase +2
We heteroepitaxially grew cobalt-doped BaFe2As2 films on (La,Sr)(Al,Ta)O3 single-crystal substrates by pulsed laser deposition using four different wavelengths and investigated how…