Strong coupling between 4f valence instability and 3d ferromagnetism in YbxFe4Sb12 studied by resonant x-ray emission spectroscopy

Hitoshi Yamaoka; Ignace Jarrige; Naohito Tsujii; Jung Fu Lin; Tsuyoshi Ikeno; Yosikazu Isikawa; Katsuhiko Nishimura; Ryuji Higashinaka; Hideyuki Sato; Nozomu Hiraoka; Hirofumi Ishii; Ku Ding Tsuei

doi:10.1103/PhysRevLett.107.177203

Strong coupling between 4f valence instability and 3d ferromagnetism in Yb_xFe₄Sb₁₂ studied by resonant x-ray emission spectroscopy

Hitoshi Yamaoka^*, Ignace Jarrige, Naohito Tsujii, Jung Fu Lin, Tsuyoshi Ikeno, Yosikazu Isikawa, Katsuhiko Nishimura, Ryuji Higashinaka, Hideyuki Sato, Nozomu Hiraoka, Hirofumi Ishii, Ku Ding Tsuei

^*Corresponding author for this work

Materials Design and Engineering

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Abstract

We have investigated the temperature and pressure dependency of the electronic structure of Yb-filled skutterudites, YbFe₄Sb₁₂ and Yb_0.88Fe₄Sb₁₂, using x-ray absorption and emission spectroscopies. An anomalous increase of the Yb valence, which is beyond the conventional Anderson model picture, is found to coincide with the onset of the ferromagnetic order in the x=0.88 sample below 20 K. In contrast, the nearly stoichiometric YbFe₄Sb₁₂ is paramagnetic down to 2 K and the Yb valence is independent of temperature. This evidences a close interplay between the magnetic instability of the Fe 3d electrons and valence instability of the Yb 4f electrons. Under pressure, a sudden increase in the valence is found to occur around 13 GPa for YbFe₄Sb₁₂ and 17 GPa for Yb_0.88Fe₄Sb₁₂.

Original language	English
Article number	177203
Journal	Physical Review Letters
Volume	107
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.107.177203
State	Published - 2011/10/19

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.107.177203

Cite this

Yamaoka, H., Jarrige, I., Tsujii, N., Lin, J. F., Ikeno, T., Isikawa, Y., Nishimura, K., Higashinaka, R., Sato, H., Hiraoka, N., Ishii, H., & Tsuei, K. D. (2011). Strong coupling between 4f valence instability and 3d ferromagnetism in Yb_xFe₄Sb₁₂ studied by resonant x-ray emission spectroscopy. Physical Review Letters, 107(17), Article 177203. https://doi.org/10.1103/PhysRevLett.107.177203

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title = "Strong coupling between 4f valence instability and 3d ferromagnetism in YbxFe4Sb12 studied by resonant x-ray emission spectroscopy",

abstract = "We have investigated the temperature and pressure dependency of the electronic structure of Yb-filled skutterudites, YbFe4Sb12 and Yb0.88Fe4Sb12, using x-ray absorption and emission spectroscopies. An anomalous increase of the Yb valence, which is beyond the conventional Anderson model picture, is found to coincide with the onset of the ferromagnetic order in the x=0.88 sample below 20 K. In contrast, the nearly stoichiometric YbFe4Sb12 is paramagnetic down to 2 K and the Yb valence is independent of temperature. This evidences a close interplay between the magnetic instability of the Fe 3d electrons and valence instability of the Yb 4f electrons. Under pressure, a sudden increase in the valence is found to occur around 13 GPa for YbFe4Sb12 and 17 GPa for Yb0.88Fe4Sb12.",

author = "Hitoshi Yamaoka and Ignace Jarrige and Naohito Tsujii and Lin, {Jung Fu} and Tsuyoshi Ikeno and Yosikazu Isikawa and Katsuhiko Nishimura and Ryuji Higashinaka and Hideyuki Sato and Nozomu Hiraoka and Hirofumi Ishii and Tsuei, {Ku Ding}",

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Yamaoka, H, Jarrige, I, Tsujii, N, Lin, JF, Ikeno, T, Isikawa, Y, Nishimura, K, Higashinaka, R, Sato, H, Hiraoka, N, Ishii, H & Tsuei, KD 2011, 'Strong coupling between 4f valence instability and 3d ferromagnetism in Yb_xFe₄Sb₁₂ studied by resonant x-ray emission spectroscopy', Physical Review Letters, vol. 107, no. 17, 177203. https://doi.org/10.1103/PhysRevLett.107.177203

TY - JOUR

T1 - Strong coupling between 4f valence instability and 3d ferromagnetism in YbxFe4Sb12 studied by resonant x-ray emission spectroscopy

AU - Yamaoka, Hitoshi

AU - Jarrige, Ignace

AU - Tsujii, Naohito

AU - Lin, Jung Fu

AU - Ikeno, Tsuyoshi

AU - Isikawa, Yosikazu

AU - Nishimura, Katsuhiko

AU - Higashinaka, Ryuji

AU - Sato, Hideyuki

AU - Hiraoka, Nozomu

AU - Ishii, Hirofumi

AU - Tsuei, Ku Ding

PY - 2011/10/19

Y1 - 2011/10/19

N2 - We have investigated the temperature and pressure dependency of the electronic structure of Yb-filled skutterudites, YbFe4Sb12 and Yb0.88Fe4Sb12, using x-ray absorption and emission spectroscopies. An anomalous increase of the Yb valence, which is beyond the conventional Anderson model picture, is found to coincide with the onset of the ferromagnetic order in the x=0.88 sample below 20 K. In contrast, the nearly stoichiometric YbFe4Sb12 is paramagnetic down to 2 K and the Yb valence is independent of temperature. This evidences a close interplay between the magnetic instability of the Fe 3d electrons and valence instability of the Yb 4f electrons. Under pressure, a sudden increase in the valence is found to occur around 13 GPa for YbFe4Sb12 and 17 GPa for Yb0.88Fe4Sb12.

AB - We have investigated the temperature and pressure dependency of the electronic structure of Yb-filled skutterudites, YbFe4Sb12 and Yb0.88Fe4Sb12, using x-ray absorption and emission spectroscopies. An anomalous increase of the Yb valence, which is beyond the conventional Anderson model picture, is found to coincide with the onset of the ferromagnetic order in the x=0.88 sample below 20 K. In contrast, the nearly stoichiometric YbFe4Sb12 is paramagnetic down to 2 K and the Yb valence is independent of temperature. This evidences a close interplay between the magnetic instability of the Fe 3d electrons and valence instability of the Yb 4f electrons. Under pressure, a sudden increase in the valence is found to occur around 13 GPa for YbFe4Sb12 and 17 GPa for Yb0.88Fe4Sb12.

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