TY - JOUR
T1 - Pressure-induced valence transition and heavy fermion state in Eu2Ni3Ge5and EuRhSi3
AU - Nakamura, Ai
AU - Okazaki, Tomoya
AU - Nakashima, Miho
AU - Amako, Yasushi
AU - Matsubayashi, Kazuyuki
AU - Uwatoko, Yoshiya
AU - Kayama, Shuei
AU - Kagayama, Tomoko
AU - Shimizu, Katsuya
AU - Uejo, Taro
AU - Akamine, Hiromu
AU - Hedo, Masato
AU - Nakama, Takao
AU - Onuki, Yoshichika
AU - Shiba, Hiroyuki
N1 - Publisher Copyright:
©2015 The Physical Society of Japan.
PY - 2015/5/15
Y1 - 2015/5/15
N2 - We succeeded in growing single crystals of Eu2Ni3Ge5 and EuRhSi3 by the In-flux method, and measured the electrical resistivity under pressures. Both compounds are Eu-divalent antiferromagnets with the Néel temperatures TN = 18.6 and 47.7 K, respectively. With increasing pressure, the resistivity in Eu2Ni3Ge5 indicates a clear kink at Tv = 220K under 8.0 GPa, for example, which corresponds to a valence transition. The valence of Eu ions deviates from divalence toward trivalence. Correspondingly, antiferromagnetic ordering disappears completely. The low-temperature resistivity is, surprisingly, very similar to the resistivity of a well-known heavy fermion superconductor CeCu2Si2, possessing a two-peak-structure based on the Kondo effect. In fact, the A value of the resistivity ρ = ρ0 + AT2 in the Fermi liquid relation becomes large, A = 0.3 μΩ·cm=K2 at 8.0 GPa. The similar characteristic features are observed in another compound EuRhSi3.
AB - We succeeded in growing single crystals of Eu2Ni3Ge5 and EuRhSi3 by the In-flux method, and measured the electrical resistivity under pressures. Both compounds are Eu-divalent antiferromagnets with the Néel temperatures TN = 18.6 and 47.7 K, respectively. With increasing pressure, the resistivity in Eu2Ni3Ge5 indicates a clear kink at Tv = 220K under 8.0 GPa, for example, which corresponds to a valence transition. The valence of Eu ions deviates from divalence toward trivalence. Correspondingly, antiferromagnetic ordering disappears completely. The low-temperature resistivity is, surprisingly, very similar to the resistivity of a well-known heavy fermion superconductor CeCu2Si2, possessing a two-peak-structure based on the Kondo effect. In fact, the A value of the resistivity ρ = ρ0 + AT2 in the Fermi liquid relation becomes large, A = 0.3 μΩ·cm=K2 at 8.0 GPa. The similar characteristic features are observed in another compound EuRhSi3.
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U2 - 10.7566/JPSJ.84.053701
DO - 10.7566/JPSJ.84.053701
M3 - Article
AN - SCOPUS:84928648142
VL - 84
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 5
M1 - 053701
ER -