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states in UPd
Al
and valence crossover in the Vicinity of Heavy-Fermion superconductivityMetoki, Naoto; Haga, Yoshinori; Yamamoto, Etsuji; Matsuda, Masaaki*
Journal of the Physical Society of Japan, 87(11), p.114712_1 - 114712_9, 2018/11
Times Cited Count：3 Percentile：29(Physics, Multidisciplinary)The localized 5
states with 5 (
) configuration of U
ion have been revealed in UPdAl. We found that the low-lying states are the same as PrPdAl flat orbitals with large 
are stabilized by a two-dimensional CEF potential in the unique crystal structure. The present study involves the valence crossover from tetravalent to trivalent in a series of AnPdAl, demonstrated by lattice and/or transport anomaly as well as many body effects in the vicinity of the boundary. The valence instability plays important role for the unusual heavy fermion superconductivity in NpPdAl.
Sb
Okane, Tetsuo; Fujimori, Shinichi; Mamiya, Kazutoshi; Okamoto, Jun; Muramatsu, Yasuji; Fujimori, Atsushi; Nagamoto, Yasuyuki*; Koyanagi, Tsuyoshi*
Journal of Physics; Condensed Matter, 15(28), p.S2197 - S2200, 2003/07
Times Cited Count：5 Percentile：31.4(Physics, Condensed Matter)The filled skutterudite compounds 
(
= alkaline earth, rare earth, actinide; 
= Fe, Ru, Os; 
= pnictogen: P, As, Sb) exhibit a variety of physical properties such as superconductivity, magnetic ordering, heavy-Fermion behavior, and metal-insulator transition. Among them, YbFeSb shows a heavy-Fermion or intermediate-valence behavior in the magnetic, electrical transport, and thermal properties, which might be associated with a valence instability of Yb atom. In this study, the electronic structure of YbFeSb have been investigated by the high-resolution photoemission spectroscopy, using He discharge lamp and synchrotron radiation as an excitation sources. The bulk and surface components of the Yb
signal is clearly divided in the spectra. The relation of the energy position between them is anomalous compared to that of the conventional mixed-valent Yb compounds.
Baba, Yuji; G.Dujardin*; P.Feulner*; D.Menzel*
Physical Review Letters, 66(25), p.3269 - 3272, 1991/06
Times Cited Count：24 Percentile：78.27(Physics, Multidisciplinary)no abstracts in English
Polyhedron, 2(5), p.423 - 424, 1983/00
Times Cited Count：16 Percentile：84.39(Chemistry, Inorganic & Nuclear)no abstracts in English
