TY - JOUR
T1 - Ga substitution effect on the valence transition of Eu2Pt6Al15
AU - Oyama, Kohei
AU - Mitsuda, Akihiro
AU - Wada, Hirofumi
AU - Narumi, Yasuo
AU - Hagiwara, Masayuki
AU - Takahashi, Ryunosuke
AU - Wadati, Hiroki
AU - Setoyama, Hiroyuki
AU - Kindo, Koichi
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Numbers JP17H06137, JP17K18758, and JP19H05824. The X-ray absorption spectroscopy was performed at the BL11 of SAGA Light Source (proposal No. 1904022F). The magnetization measurements in mid-pulsed magnetic fields were carried out at the Center for Advanced High Magnetic Field Science in Osaka University under the Visiting Researcher’s Program of the Institute for Solid State Physics, The University of Tokyo.
Funding Information:
Acknowledgement This work was supported by JSPS KAKENHI Grant Numbers JP17H06137, JP17K18758, and JP19H05824. The X-ray absorption spectroscopy was performed at the BL11 of SAGA Light Source (proposal No. 1904022F). The magnetization measurements in mid-pulsed magnetic fields were carried out at the Center for Advanced High Magnetic Field Science in Osaka University under the Visiting Researcher’s Program of the Institute for Solid State Physics, The University of Tokyo.
Publisher Copyright:
© 2020 The Physical Society of Japan.
PY - 2020/10/29
Y1 - 2020/10/29
N2 - We have synthesized polycrystalline samples of Eu2Pt6(Al1−xGax)15 (x = 0, 0.05, 0.1, 0.2, 0.3, and 1) and examined electrical resistivity, magnetic susceptibility, high-field magnetization, and X-ray absorption spectra at the Eu L3-edge. With increasing x up to 0.1, the first-order valence transition is shifted to low temperatures. For x ≥ 0.1, a nearly divalent state is stabilized down to the lowest temperature, and an antiferromagnetic order emerges below TN = 13–16 K. For x = 0 and 0.05, magnetization curves in pulsed magnetic fields at T = 4.2 K clarify a field-induced valence transition at Bv = 29 and 19 T, respectively. The ratio of Bv to the valence transition temperature Tv is close to a universal value of other Eu-based systems with a different crystal structure (ThCr2Si2 type). The phase boundary curve in the T–B phase diagram is discussed thermodynamically.
AB - We have synthesized polycrystalline samples of Eu2Pt6(Al1−xGax)15 (x = 0, 0.05, 0.1, 0.2, 0.3, and 1) and examined electrical resistivity, magnetic susceptibility, high-field magnetization, and X-ray absorption spectra at the Eu L3-edge. With increasing x up to 0.1, the first-order valence transition is shifted to low temperatures. For x ≥ 0.1, a nearly divalent state is stabilized down to the lowest temperature, and an antiferromagnetic order emerges below TN = 13–16 K. For x = 0 and 0.05, magnetization curves in pulsed magnetic fields at T = 4.2 K clarify a field-induced valence transition at Bv = 29 and 19 T, respectively. The ratio of Bv to the valence transition temperature Tv is close to a universal value of other Eu-based systems with a different crystal structure (ThCr2Si2 type). The phase boundary curve in the T–B phase diagram is discussed thermodynamically.
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U2 - 10.7566/JPSJ.89.114713
DO - 10.7566/JPSJ.89.114713
M3 - Article
AN - SCOPUS:85096487099
VL - 89
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 11
ER -