Remeika相Pr $_3$ Ir PDMATHAAB Ge $_{13}$的非磁基态、晶场效应和重费米子行为
Nonmagnetic ground state, Crystal field effects and Heavy-fermion behaviour in the Remeika Phase: Pr$_3$Ir$_4$Ge$_{13}$
摘要：
本文报道了准方钴矿化合物Pr $_3$ Ir $_4$ Ge $_{13}$的磁性、电子和输运性质，测量了它们的磁化率$χ(T)$、电阻率$ρ(T)$、比热$C_p(T)$、热导率$κ(T)$、热电势$S(T)$和霍尔系数$R_\mathrm{H}(T)$. Pr $_3$ Ir $_4$ Ge $_{13}$在低至1.9 K时不显示任何相变。磁测量和比测量表明，该系统具有晶体电场单重态基态，它与第一激发态的距离约为37 K。$ρ(T)$在整个研究温度范围内表现出负的电阻温度系数，这可以用Mott的杂质带导电机制来解释。$R_\mathrm{H}(T)$的测量结果表明，Pr $_3$ Ir $_4$ Ge $_{13}$是一种低载流子密度的半金属，其输运性质表现为金属-非金属交叉行为.在整个温度范围内的调查，观察到大的Seebeck值，$S$和$S/T$的温度变化的分析表明，没有迹象的强相关性之间的Pr 4 $f^2$和费米能级附近的导电电子状态。大的索末菲系数$γ= 150$ ~mJ/（mol K $^2$）表明，在动力学晶场涨落中形成了中等重费米子态.
英文摘要：
We report the magnetic, electronic and transport properties of the quasi-skutterudite compound Pr$_3$Ir$_4$Ge$_{13}$ by means of magnetic susceptibility $χ(T)$, electrical resistivity $ρ(T)$, specific heat $C_p(T)$, thermal conductivity $κ(T)$, thermoelectric power $S(T)$ and Hall coefficient $R_\mathrm{H}(T)$ measurements. Pr$_3$Ir$_4$Ge$_{13}$ does not show any phase transition down to 1.9 K. Magnetic, and specific measurements show that the system possesses a crystal electric field singlet ground state that is separated from the first excited state by about 37 K. $ρ(T)$ shows a negative temperature coefficient of resistance for the whole temperature range studied and which can be explained in terms of Mott's impurity band conduction mechanism. $R_\mathrm{H}(T)$ measurements show that Pr$_3$Ir$_4$Ge$_{13}$ is a low-carrier density semimetal and its transport properties indicate a metallic-non metallic cross over behaviour. Large Seebeck values were observed for the entire temperature range of investigation, and the analysis of temperature variation of $S$ and $S/T$ showed no sign of strong correlation between the Pr 4$f^2$ and conduction electron states near Fermi level. A large Sommerfeld coefficient, $γ= 150$~mJ/(mol K$^2$) indicates the formation of a moderate heavy-fermion state emerging from the dynamical crystal field fluctuations.
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