TY - JOUR
T1 - Large magnetoresistance and volume expansion associated with valence transition in Eu(Rh1-xIrx)2Si2
AU - Mitsuda, Akihiro
AU - Fujimoto, Takumi
AU - Kishaba, Eigo
AU - Hamano, Suguru
AU - Kondo, Akihiro
AU - Kindo, Koichi
AU - Wada, Hirofumi
N1 - Funding Information:
We thank M. Watanabe of the Center of Advanced Instrumental Analysis, Kyushu University for helping us perform the EDX analysis. This work was partly supported by a Grant-in-Aid for Scientific Research on the Innovative Area "Heavy Electrons" (Grant Number 23102720) from the Ministry of Education, Culture, Sports, Science and Technology, and by a Grant-in-Aid for Scientific Research (C) (Grant Number 23540415) from the Japan Society for the Promotion of Science. The magnetization measurements in pulsed magnetic fields were carried out under the Visiting Researcher's Program of the Institute for Solid State Physics, The University of Tokyo.
Publisher Copyright:
©2016 The Physical Society of Japan.
PY - 2016/12/15
Y1 - 2016/12/15
N2 - We report lattice parameters as a function of temperature, magnetization curves, and magnetoresistance of polycrystalline samples of Eu(Rh1-xIrx)2Si2. The lattice parameters a and c for x = 0.3, 0.4, and 0.5 jump at around the valence transition temperature Tv. For these samples, the high-temperature (larger a, c) and low-temperature (smaller a, c) phases, the volume fraction of which changes with temperature, coexist at around Tv, which means that the valence transition is of the first order. The magnetization curves of x = 0.3, 0.4, and 0.5 at T = 4.2 K exhibit a metamagnetic transition with a large hysteresis, implying a first-order field-induced valence transition. The transition field Bv is proportional to Tv, Bv = αTv with α = 0.36 T=K. For x = 0.3, a large negative magnetoresistance associated with the field-induced valence transition is observed. The origin of the negative magnetoresistance is discussed.
AB - We report lattice parameters as a function of temperature, magnetization curves, and magnetoresistance of polycrystalline samples of Eu(Rh1-xIrx)2Si2. The lattice parameters a and c for x = 0.3, 0.4, and 0.5 jump at around the valence transition temperature Tv. For these samples, the high-temperature (larger a, c) and low-temperature (smaller a, c) phases, the volume fraction of which changes with temperature, coexist at around Tv, which means that the valence transition is of the first order. The magnetization curves of x = 0.3, 0.4, and 0.5 at T = 4.2 K exhibit a metamagnetic transition with a large hysteresis, implying a first-order field-induced valence transition. The transition field Bv is proportional to Tv, Bv = αTv with α = 0.36 T=K. For x = 0.3, a large negative magnetoresistance associated with the field-induced valence transition is observed. The origin of the negative magnetoresistance is discussed.
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U2 - 10.7566/JPSJ.85.124703
DO - 10.7566/JPSJ.85.124703
M3 - Article
AN - SCOPUS:84999723708
SN - 0031-9015
VL - 85
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 12
M1 - 124703
ER -