Possible Low-Temperature Strongly Correlated Electron Behavior from Multipole Fluctuations in PrMg3 with Cubic Non-Kramers Γ3 Doublet Ground State
Possible Low-Temperature Strongly Correlated Electron Behavior from Multipole Fluctuations in PrMg3 with Cubic Non-Kramers Γ3 Doublet Ground State
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DOI：
10.1143/jpsj.75.073705
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发表时间：
2006-07
影响因子：
1.7
通讯作者：
H. Tanida;H. Suzuki;S. Takagi;H. Onodera;K. Tanigaki
中科院分区：
文献类型：
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作者：
H. Tanida;H. Suzuki;S. Takagi;H. Onodera;K. Tanigaki
根据磁化率χ（T）和比热CP（T）研究了PrMg 3单晶的磁性和热力学性质. CP（T）在0.9K时出现一个宽范围的反常峰，其峰值为1.8J/（mol K），同时χ（T）的Van-Vleck行为表明低T特性是由多极效应引起的（四极O 20和O 22，以及八极T x y z）的自由度，Pr 3+在立方晶电场中的非Kramers Γ 3二重态基态。然而，低T C P（T）反常并不是用双通道Kondo模型来描述的，而是更类似于Kondo温度T K = 1.3 K的单通道Kondo模型，包括它的弱外场依赖性。C P（T）在低至0.54 K时没有发现合作相变的证据，这表明在低T时，通过与C P（T）的杂化形成强关联的电子态，Γ 3多极自由度被猝灭。
The magnetic and thermodynamic properties of PrMg 3 single crystals were investigated based on the magnetic susceptibility χ( T ) and the specific heat C P ( T ). An observed broad anomaly in C P ( T ) with a peak ∼1.8 J/(mol K) at 0.9 K, together with Van-Vleck-like behavior of χ( T ), indicates that the low- T properties are ascribed to the multipole (quadrupole O 20 and O 22 , and octupole T x y z ) degrees of freedom of a nonmagnetic, non-Kramers Γ 3 doublet ground state in the cubic crystalline electric field of Pr 3+ . The low- T C P ( T ) anomaly, however, is not described in terms of the two-channel Kondo model, but is more similar to that for the single-channel Kondo model with the Kondo temperature T K = 1.3 K, including its weak external-field dependence. No evidence for a cooperative phase transition was detected down to 0.54 K in C P ( T ), suggesting that the Γ 3 multipole degrees of freedom are quenched at low T by forming a strongly correlated electronic state through the hybridization wit...