TY - JOUR
T1 - Effects of magnetic field and pressure on the valence-fluctuating antiferromagnetic compound EuPt2Si2
AU - Takeuchi, Tetsuya
AU - Yara, Tomoyuki
AU - Ashitomi, Yousuke
AU - Iha, Wataru
AU - Kakihana, Masashi
AU - Nakashima, Miho
AU - Amako, Yasushi
AU - Honda, Fuminori
AU - Homma, Yoshiya
AU - Aoki, Dai
AU - Uwatoko, Yoshiya
AU - Kida, Takanori
AU - Tahara, Time
AU - Hagiwara, Masayuki
AU - Haga, Yoshinori
AU - Hedo, Masato
AU - Nakama, Takao
AU - Onuki, Yoshichika
N1 - Funding Information:
Acknowledgments This work was supported by JSPS KAKENHI Grant Numbers JP16H01078, JP17K05547, JP16K05453, JP15K05156, JP15H05884, JP15H05882, and JP16H04006. The studies in pulsed high magnetic fields were carried out at the Center for Advanced High Magnetic Field Science under the Visiting Researcher’s Program of the Institute for Solid State Physics, the University of Tokyo.
Publisher Copyright:
© 2018 The Physical Society of Japan.
PY - 2018
Y1 - 2018
N2 - The effects of a magnetic field and pressure on the Kondo-like behavior in the valence-fluctuating antiferromagnetic compound EuPt2Si2 were studied using single-crystalline samples. The logarithmic temperature dependence of the electrical resistivity, ρ(T) ∞ -ln T, which is reminiscent of the Kondo effect, is robust against the application of a magnetic field. On the other hand, the temperature dependences of ρ(T) and thermoelectric power S(T) change markedly under pressure. In addition, the antiferromagnetically ordered temperature TN1 = 21K at ambient pressure decreases gradually and reaches zero at approximately P = 4 GPa. From the comparison of the magnetic properties of EuPt2Si2 with those of EuCu2(Ge0.4Si0.6)2, the observed anomalous features for EuPt2Si2 at low temperatures are inferred to be due to a valence fluctuation and=or a valence change of the Eu ions at low temperatures.
AB - The effects of a magnetic field and pressure on the Kondo-like behavior in the valence-fluctuating antiferromagnetic compound EuPt2Si2 were studied using single-crystalline samples. The logarithmic temperature dependence of the electrical resistivity, ρ(T) ∞ -ln T, which is reminiscent of the Kondo effect, is robust against the application of a magnetic field. On the other hand, the temperature dependences of ρ(T) and thermoelectric power S(T) change markedly under pressure. In addition, the antiferromagnetically ordered temperature TN1 = 21K at ambient pressure decreases gradually and reaches zero at approximately P = 4 GPa. From the comparison of the magnetic properties of EuPt2Si2 with those of EuCu2(Ge0.4Si0.6)2, the observed anomalous features for EuPt2Si2 at low temperatures are inferred to be due to a valence fluctuation and=or a valence change of the Eu ions at low temperatures.
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U2 - 10.7566/JPSJ.87.074709
DO - 10.7566/JPSJ.87.074709
M3 - Article
AN - SCOPUS:85049643135
SN - 0031-9015
VL - 87
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 7
M1 - 074709
ER -