TY - JOUR
T1 - Temperature-induced valence transition in EuNi2(Si1–xGex)2 investigated by high-energy resolution fluorescence detection X-ray absorption spectroscopy
AU - Shimokasa, Ryohei
AU - Kawamura, Naomi
AU - Matsumoto, Takayuki
AU - Kawakami, Koki
AU - Kawabata, Taku
AU - Isumi, Gen
AU - Uozumi, Takayuki
AU - Mitsuda, Akihiro
AU - Wada, Hirofumi
AU - Mizumaki, Masaichiro
AU - Mimura, Kojiro
N1 - Funding Information:
The HERFD-XAS experiments were performed at BL39XU of SPring-8 with the approval of JASRI (Proposal Nos. 2016B1961, 2017A1061, 2017A1857, 2017B1066, 2017B1608, and 2018A1053). This work was partly supported by Grant-in-Aid for Scientific Researchers “KAKENHI” (grant No. 15K05195 ) from JSPS .
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/10
Y1 - 2020/10
N2 - Electronic structures of the temperature-induced valence transition system EuNi2(Si1–xGex)2 with x = 0.70, 0.79, 0.82 have been investigated by means of high-energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS). The HERFD-XAS spectra clearly change their intensities of Eu2+ and Eu3+ components which directly reflect the temperature-induced valence transition. For x = 0.70, gradual spectral change exhibits a continuous valence transition, while drastic changes for x = 0.79 and 0.82 indicate first-order valence transitions. High-energy resolution measurements made it possible to observe additional fine structures which are recognized more clearly below the transition temperature. Existence of these fine structures suggests that many-body effect plays an important role in the temperature-induced valence transition of this system. The variation of Eu mean valence estimated from the HERFD-XAS spectra for each x correlates with that of magnetic susceptibility.
AB - Electronic structures of the temperature-induced valence transition system EuNi2(Si1–xGex)2 with x = 0.70, 0.79, 0.82 have been investigated by means of high-energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS). The HERFD-XAS spectra clearly change their intensities of Eu2+ and Eu3+ components which directly reflect the temperature-induced valence transition. For x = 0.70, gradual spectral change exhibits a continuous valence transition, while drastic changes for x = 0.79 and 0.82 indicate first-order valence transitions. High-energy resolution measurements made it possible to observe additional fine structures which are recognized more clearly below the transition temperature. Existence of these fine structures suggests that many-body effect plays an important role in the temperature-induced valence transition of this system. The variation of Eu mean valence estimated from the HERFD-XAS spectra for each x correlates with that of magnetic susceptibility.
UR - http://www.scopus.com/inward/record.url?scp=85082537380&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85082537380&partnerID=8YFLogxK
U2 - 10.1016/j.radphyschem.2019.02.009
DO - 10.1016/j.radphyschem.2019.02.009
M3 - Article
AN - SCOPUS:85082537380
SN - 0969-806X
VL - 175
JO - Radiation Physics and Chemistry
JF - Radiation Physics and Chemistry
M1 - 108150
ER -