Simultaneous pressure-induced magnetic and valence transitions in type-I clathrate Eu8Ga16Ge30

Takahiro Onimaru; Satoshi Tsutsui; Masaichiro Mizumaki; Naomi Kawamura; Naoki Ishimatsu; Marcos A. Avila; Shuhei Yamamoto; Haruki Yamane; Koichiro Suekuni; Kazunori Umeo; Tetsuji Kume; Satoshi Nakano; Toshiro Takabatake

doi:10.7566/JPSJ.83.013701

Simultaneous pressure-induced magnetic and valence transitions in type-I clathrate Eu₈Ga₁₆Ge₃₀

Takahiro Onimaru, Satoshi Tsutsui, Masaichiro Mizumaki, Naomi Kawamura, Naoki Ishimatsu, Marcos A. Avila, Shuhei Yamamoto, Haruki Yamane, Koichiro Suekuni, Kazunori Umeo, Tetsuji Kume, Satoshi Nakano, Toshiro Takabatake

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Abstract

We have performed X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) measurements at pressures up to 17 GPa for the clathrate Eu₈Ga₁₆Ge₃₀ (Curie temperature T _C = 36 K). The temperature dependence of the XMCD spectra agrees well with that of the DC magnetization at ambient pressure. The T_C is gradually enhanced with increasing pressures up to 13.3 GPa, and the divalent state of the Eu ions with J = 7/2 remains stable, but at 17GPa the XMCD intensity is strongly suppressed and a spectral weight corresponding to the trivalent state of Eu ions (with no magnetic moment) appears in the XAS spectrum. The concurrent change from the type-I clathrate structure to an amorphous phase has been observed by X-ray diffraction experiment. We conclude that the amorphization of this compound induces the mixed valence state, which collapses the ferromagnetism.

Original language	English
Article number	013701
Journal	journal of the physical society of japan
Volume	83
Issue number	1
DOIs	https://doi.org/10.7566/JPSJ.83.013701
Publication status	Published - Jan 15 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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Onimaru, T., Tsutsui, S., Mizumaki, M., Kawamura, N., Ishimatsu, N., Avila, M. A., Yamamoto, S., Yamane, H., Suekuni, K., Umeo, K., Kume, T., Nakano, S., & Takabatake, T. (2014). Simultaneous pressure-induced magnetic and valence transitions in type-I clathrate Eu₈Ga₁₆Ge₃₀. journal of the physical society of japan, 83(1), Article 013701. https://doi.org/10.7566/JPSJ.83.013701

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title = "Simultaneous pressure-induced magnetic and valence transitions in type-I clathrate Eu8Ga16Ge30",

abstract = "We have performed X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) measurements at pressures up to 17 GPa for the clathrate Eu8Ga16Ge30 (Curie temperature T C = 36 K). The temperature dependence of the XMCD spectra agrees well with that of the DC magnetization at ambient pressure. The TC is gradually enhanced with increasing pressures up to 13.3 GPa, and the divalent state of the Eu ions with J = 7/2 remains stable, but at 17GPa the XMCD intensity is strongly suppressed and a spectral weight corresponding to the trivalent state of Eu ions (with no magnetic moment) appears in the XAS spectrum. The concurrent change from the type-I clathrate structure to an amorphous phase has been observed by X-ray diffraction experiment. We conclude that the amorphization of this compound induces the mixed valence state, which collapses the ferromagnetism.",

author = "Takahiro Onimaru and Satoshi Tsutsui and Masaichiro Mizumaki and Naomi Kawamura and Naoki Ishimatsu and Avila, {Marcos A.} and Shuhei Yamamoto and Haruki Yamane and Koichiro Suekuni and Kazunori Umeo and Tetsuji Kume and Satoshi Nakano and Toshiro Takabatake",

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doi = "10.7566/JPSJ.83.013701",

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T1 - Simultaneous pressure-induced magnetic and valence transitions in type-I clathrate Eu8Ga16Ge30

AU - Onimaru, Takahiro

AU - Tsutsui, Satoshi

AU - Mizumaki, Masaichiro

AU - Kawamura, Naomi

AU - Ishimatsu, Naoki

AU - Avila, Marcos A.

AU - Yamamoto, Shuhei

AU - Yamane, Haruki

AU - Suekuni, Koichiro

AU - Umeo, Kazunori

AU - Kume, Tetsuji

AU - Nakano, Satoshi

AU - Takabatake, Toshiro

PY - 2014/1/15

Y1 - 2014/1/15

N2 - We have performed X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) measurements at pressures up to 17 GPa for the clathrate Eu8Ga16Ge30 (Curie temperature T C = 36 K). The temperature dependence of the XMCD spectra agrees well with that of the DC magnetization at ambient pressure. The TC is gradually enhanced with increasing pressures up to 13.3 GPa, and the divalent state of the Eu ions with J = 7/2 remains stable, but at 17GPa the XMCD intensity is strongly suppressed and a spectral weight corresponding to the trivalent state of Eu ions (with no magnetic moment) appears in the XAS spectrum. The concurrent change from the type-I clathrate structure to an amorphous phase has been observed by X-ray diffraction experiment. We conclude that the amorphization of this compound induces the mixed valence state, which collapses the ferromagnetism.

AB - We have performed X-ray magnetic circular dichroism (XMCD) and X-ray absorption spectroscopy (XAS) measurements at pressures up to 17 GPa for the clathrate Eu8Ga16Ge30 (Curie temperature T C = 36 K). The temperature dependence of the XMCD spectra agrees well with that of the DC magnetization at ambient pressure. The TC is gradually enhanced with increasing pressures up to 13.3 GPa, and the divalent state of the Eu ions with J = 7/2 remains stable, but at 17GPa the XMCD intensity is strongly suppressed and a spectral weight corresponding to the trivalent state of Eu ions (with no magnetic moment) appears in the XAS spectrum. The concurrent change from the type-I clathrate structure to an amorphous phase has been observed by X-ray diffraction experiment. We conclude that the amorphization of this compound induces the mixed valence state, which collapses the ferromagnetism.

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ER -

Simultaneous pressure-induced magnetic and valence transitions in type-I clathrate Eu₈Ga₁₆Ge₃₀

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