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to 34 GPaKlotz, S.*; Casula, M.*; Komatsu, Kazuki*; Machida, Shinichi*; Hattori, Takanori
Physical Review B, 100(2), p.020101_1 - 020101_5, 2019/07
Times Cited Count：11 Percentile：52.56(Materials Science, Multidisciplinary)Ytterbium dihydride (YbH) shows a well-known transition at 
16 GPa from a CaH-type structure to a high-pressure (high-
) phase with Yb at hcp sites and unknown H-positions. Here, we report its complete structure determination by neutron diffraction at 34 GPa. Hydrogen(deuterium) is located at 2
and 2
positions of space group 
, thus forming a high-symmetry "collapsed" close-packed lattice. The transition is sluggish and can be seen as a transfer of 1/2 of the hydrogen atoms from strongly corrugated H-layers to interstitial sites of the Yb-lattice. We demonstrate by first-principles calculations that the transition is related to a change from a completely filled 
-electron configuration to a fractional -hole (0.25 h) occupation in the high- phase. The 
charge transfer closes the gap at the transition and leads to a metallic ground state with sizeable electron-phonon interaction involving out-of-plane vibrational modes of interstitial hydrogen.
Nishimura, Akihiko; Sugiyama, Akira; Usami, Tsutomu; Ohara, K.*
Journal of Materials Science; Materials in Electronics, 14(1), p.1 - 3, 2003/01
no abstracts in English
crystal at low temperatureKawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*
Optics Express (Internet), 10(10), p.455 - 460, 2002/05
Times Cited Count：48 Percentile：84.83(Optics)no abstracts in English
Nishimura, Akihiko; Akaoka, Katsuaki; Ozu, Akira; Usami, Tsutomu*
Journal of Nuclear Science and Technology, 38(12), p.1043 - 1047, 2001/12
no abstracts in English
Nishimura, Akihiko; Akaoka, Katsuaki; Ozu, Akira; Sugiyama, Akira; Usami, Tsutomu*; Matoba, Toru
Advanced High-power Lasers (Proceedings of SPIE Vol.3889), p.414 - 419, 2000/00
no abstracts in English
Nishimura, Akihiko; Ozu, Akira; Akaoka, Katsuaki; Usami, Tsutomu*; *; Matoba, Toru
Denki Gakkai Hikari, Ryoshi Debaisu Kenkyukai Shiryo OQD-99-1-6, p.25 - 28, 1999/03
no abstracts in English
Nishimura, Akihiko; Ozu, Akira; Sugiyama, Akira; Maruyama, Yoichiro; Arisawa, Takashi; Takuma, Hiroshi; Nees, J.*; Biswal, S.*; Mourou, G.*; *; et al.
Technical Digest on CLEO'98, P. 177, 1998/05
no abstracts in English
Nishimura, Akihiko; Ozu, Akira; Sugiyama, Akira; Maruyama, Yoichiro; Arisawa, Takashi; *; Nees, J.*; Biswal, S.*; G.Mourou*; Erickson, E.*; et al.
Solid State Lasers VII, 3265, p.234 - 241, 1998/00
no abstracts in English
MUO
(M=Sc, Y, Gd, Yb, Mn)Hinatsu, Yukio
Journal of Solid State Chemistry, 105, p.100 - 106, 1993/00
Times Cited Count：11 Percentile：47.87(Chemistry, Inorganic & Nuclear)no abstracts in English
Journal of Nuclear Science and Technology, 11(8), p.334 - 338, 1974/08
Times Cited Count：4no abstracts in English
