Heavy Fermion State Based on the Kondo Effect in EuNi2P2
Heavy Fermion State Based on the Kondo Effect in EuNi2P2
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DOI：
10.7566/jpsj.82.083708
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发表时间：
2013-08-01
影响因子：
1.7
通讯作者：
Onuki, Yoshichika
中科院分区：
文献类型：
--
作者：
Hiranaka, Yuichi;Nakamura, Ai;Onuki, Yoshichika
已知EuNi 2 P2是电子比热系数γ = 100 mJ/（K-2·mol）的重费米子化合物。我们生长单晶，并通过测量电阻率、磁化率、高场磁化强度、比热和热膨胀来研究它们的电子和磁性。本重费米子状态被澄清的基础上的近藤效应，在CeRu 2Si 2，揭示了一个强烈的收缩的体积低于约100 K的热膨胀的温度依赖性。的4f-电子的体积热膨胀（Δ V/V）（4f）和平均Eu价的贡献的温度依赖性被发现在EuNi 2 P2显示良好的缩放。
EuNi2P2 is known as a heavy fermion compound with an electronic specific heat coefficient gamma = 100 mJ/(K-2.mol). We grew single crystals and studied their electronic and magnetic properties by measuring the electrical resistivity, magnetic susceptibility, high-field magnetization, specific heat, and thermal expansion. The present heavy fermion state is clarified to be based on the Kondo effect as in CeRu2Si2, revealing an intensive shrinkage of the volume below about 100 K in the temperature dependence of thermal expansion. The temperature dependences of the 4f-electron contribution to the volume thermal expansion (Delta V/V)(4f) and the average Eu valence are found to show good scaling in EuNi2P2.