Details

Autor(en) / Beteiligte

• Yasui, A
• Saitoh, Y
• Fujimori, S-i
• Kawasaki, I
• Okane, T
• Takeda, Y
• Lapertot, G
• Knebel, G
• Matsuda, T D
• Haga, Y
• Yamagami, H

Titel

Observation of bulk band dispersions of YbRh sub(2)Si sub(2) using soft x-ray angle-resolved photoemission spectroscopy

Ist Teil von

• Physical review. B, Condensed matter and materials physics, 2013-02, Vol.87 (7)

Erscheinungsjahr

2013

Quelle

PROLA

Beschreibungen/Notizen

• We have performed soft x-ray angle-resolved photoemission spectroscopy (ARPES) measurements on YbRh sub(2)Si sub(2) and clarified its three-dimensional bulk valence-band structures. The ARPES spectra have not only Yb super(3+) multiplet peaks but also a finite contribution of Yb super(2+) peaks at 15 K, corresponding to the valence fluctuating behavior in this compound. This means that Yb 4[functionof] electrons in this compound have itinerant character below the TK. We have found that dispersions of the valence bands except the vicinity of the Yb 4[functionof] bands agree better with those of the band-structure calculation of LuRh sub(2)Si sub(2) than those of YbRh sub(2)Si sub(2) within a local-density approximation. In addition, the Yb 3d-4[functionof] resonant photoemission spectra of YbRh sub(2)Si sub(2) strongly suggest the existence of Yb 5d electrons in the valence band. We conclude that the charge transfer from the Yb 4[functionof] state to the Yb 5d state has an important role in the formation of the valence band of YbRh sub(2) Si sub(2).