Pressure-induced valence change of YbNiGe3 investigated by resonant x-ray emission spectroscopy at the Yb L-3 edge

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Sato, Hitoshi ^[1] ; Yamaoka, Hitoshi ^[2] ; Utsumi, Yuki ^[3] ; Nagata, Heisuke ^[3] ; Avila, Marcos A. ^[4] ; Ribeiro, Raquel A. ^[4] ; Umeo, Kazunori ^[5] ; Takabatake, Toshiro ^{[6, 7]} ; Zekko, Yumiko ^[8] ; Mizuki, Jun'ichiro ^{[8, 9]} ; Lin, Jung-Fu ^[10] ; Hiraoka, Nozomu ^[11] ; Ishii, Hirofumi ^[11] ; Tsuei, Ku-Ding ^[11] ; Namatame, Hirofumi ^[1] ; Taniguchi, Masaki ^{[1, 3]}

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^[1] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7398526 - Japan

^[2] RIKEN, SPring Ctr 8, Sayo, Hyogo 6795148 - Japan

^[3] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526 - Japan

^[4] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210971 Santo Andre, SP - Brazil

^[5] Hiroshima Univ, N BARD, Cryogen & Instrumental Anal Div, Higashihiroshima 7398526 - Japan

^[6] Hiroshima Univ, Inst Adv Mat Res, Higashihiroshima 7398530 - Japan

^[7] Hiroshima Univ, AdSM, Dept Quantum Matter, Higashihiroshima 7398530 - Japan

^[8] Kwansei Gakuin Univ, Grad Sch Sci & Technol, Sanda, Hyogo 6691337 - Japan

^[9] Japan Atom Energy Agcy, SPring 8, Sayo, Hyogo 6795148 - Japan

^[10] Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 - USA

^[11] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076 - Taiwan

• Tipo de documento: Artigo Científico
• Fonte: Physical Review B; v. 89, n. 4 JAN 10 2014.
• Citações Web of Science: 14

Resumo

Pressure dependence of the Yb valence in YbNiGe3 has been investigated up to 15.6 GPa at 300 K and up to 7.7 GPa at 17 K by means of x-ray absorption spectroscopy in L alpha(1) partial fluorescence yield mode and resonant x-ray emission spectroscopy around the Yb L-3 absorption edge. The Yb valence in YbNiGe3 at ambient pressure strongly fluctuates with the mean valence of v = 2.52 +/- 0.01 at 300 K. The Yb valence rapidly changes toward a trivalent state with pressure up to similar to 5 GPa, slowly increases up to similar to 10 GPa, and then reaches a saturated value of v similar to 2.87 at 15.6 GPa. The Yb valence at 17 K slightly decreases compared to that at 300 K; v similar to 2.45 at ambient pressure and similar to 2.72 at 7.7 GPa. We found that the pressure-induced change in the intensity of a quadrupole component in the x-ray absorption spectra shows the same trend as the Yb valence in YbNiGe3. In contrast to YbNiGe3, the Yb valence in YbNiSi3 is nearly 3 at ambient pressure with almost no temperature dependence. (AU)

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