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Journal Articles

High-pressure structure and electronic properties of YbD$$_{2}$$ to 34 GPa

Klotz, S.*; Casula, M.*; Komatsu, Kazuki*; Machida, Shinichi*; Hattori, Takanori

Physical Review B, 100(2), p.020101_1 - 020101_5, 2019/07

 Times Cited Count:5 Percentile:33.23(Materials Science, Multidisciplinary)

Ytterbium dihydride (YbH$$_{2}$$) shows a well-known transition at $$approx$$16 GPa from a CaH$$_{2}$$-type structure to a high-pressure (high-$$P$$) 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$$a$$ and 2$$d$$ positions of space group $$P6_{3}/mmc$$, 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 $$f$$-electron configuration to a fractional $$f$$-hole ($$approx$$0.25 h) occupation in the high-$$P$$ phase. The $$f$$ $$to$$ $$d$$ 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.

Journal Articles

Improved cooling performance of ytterbium-doped glass combined with sapphire

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

Journal Articles

Improved high-field laser characteristics of a diode-pumped Yb:LiYF$$_{4}$$ crystal at low temperature

Kawanaka, Junji; Yamakawa, Koichi; Nishioka, Hajime*; Ueda, Kenichi*

Optics Express (Internet), 10(10), p.455 - 460, 2002/05

 Times Cited Count:37 Percentile:18.66(Optics)

no abstracts in English

Journal Articles

Temporal change of thermal lens effects on highly pumped ytterbium glass by wavefront measurement

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

Journal Articles

Thermal lens effects on highly pumped Yb:glass

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

Journal Articles

Yb:glass laser oscillation and wavefront measurements under high intensity pumping

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

Journal Articles

High energy flashlamp pumped Ti-sapphire laser for Yb:glass chirped pulse amplification

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

Journal Articles

High energy flashlamp pumped Ti-sapphire laser for Yb:glass CPA

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

Journal Articles

Magnetic properties of ordered perovskites Ba$$_{2}$$MUO$$_{6}$$(M=Sc, Y, Gd, Yb, Mn)

Hinatsu, Yukio

Journal of Solid State Chemistry, 105, p.100 - 106, 1993/00

 Times Cited Count:11 Percentile:50.95(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Determination of trace impurities in high purity lutetium oxide by neutron activation with aid of cation-exchange separation

Journal of Nuclear Science and Technology, 11(8), p.334 - 338, 1974/08

 Times Cited Count:4

no abstracts in English

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