Pressure-induced large valence transitions in Yb-Cu binary intermetallic systems

被引:3
作者
Yamaoka, Hitoshi [1 ]
Ohmura, Ayako [2 ]
Tsujii, Naohito [3 ]
Ishii, Hirofumi [4 ]
Hiraoka, Nozomu [4 ]
Sato, Hitoshi [5 ]
Sawada, Masahiro [5 ]
机构
[1] RIKEN SPring 8 Ctr, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan
[2] Niigata Univ, Fac Sci, Niigata 9502181, Japan
[3] Natl Inst Mat Sci, Res Ctr Mat Nanoarchitecton, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan
[5] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima, Hiroshima 7390046, Japan
基金
日本学术振兴会;
关键词
X-RAY-ABSORPTION; ELECTRICAL-RESISTIVITY; ELECTRONIC-STRUCTURE; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; YTTERBIUM-COPPER; KONDO-LATTICE; RARE-EARTHS; DEPENDENCE; HEAT;
D O I
10.1103/PhysRevB.109.155147
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Electronic and crystal structures of YbCu, YbCu 2 , and YbCu 6 . 5 under pressure were studied by high-resolution x-ray absorption spectroscopy (XAS) and x-ray diffraction. We found pressure-induced large valence transitions on the order of 0.3 in these Yb compounds. YbCu exhibited a first -order transition with a sudden change in the Yb valence at 4 GPa, at which a structural transition was not accompanied. With further increasing pressure, YbCu shows a structural transition from the FeB-type to the cubic CsCl-type structure around 10 GPa, where the Yb valence increases only gradually. In YbCu 2 , a structural transition was not observed up to 11.8 GPa, while the Yb valence shows a rapid increase around 4-7 GPa, indicating a significant change in the electronic structure. Anomalous reentrant valence transition to a lower valence state was found at low pressures of 3-4 GPa in YbCu 6 . 5 without the structural phase transition. It is suggested that the anomaly in YbCu 6 . 5 is possibly correlated to the electronic structure of the Cu d band. On the other hand, we found that these anomalous large changes in the Yb valences were linked to anomalies in crystal structures although there were no structural phase transitions. Complementary to the measurements of XAS at the Yb L 3 absorption edge, we also performed XAS at the Cu - L 3 absorption edge and measured the valence band spectra at ambient pressure.
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页数:10
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