论文标题
在Remeika阶段中的非磁基状态，水晶场效应和重铁行为：Pr $ _3 $ ir $ _4 $ ge $ _ {13} $
Nonmagnetic ground state, Crystal field effects and Heavy-fermion behaviour in the Remeika Phase: Pr$_3$Ir$_4$Ge$_{13}$
论文作者
论文摘要
我们通过磁化易感$χ（t）$，电阻率$ρ（t）$，特定的热量$ C_P（T）$，热电率$ $ $ $ $ $ ch $ $ ch $κ（t）$ $κ（t），Thermotitive $ $ co $κ（T）$，Thermotovitive $ ch $（T）$，Thermotovitive $ ch $ $κ$κ$κ（T） $ r_ \ mathrm {h}（t）$测量。 Pr$_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）$测量表明，pr $ _3 $ ir $ _4 $ ge $ _ {13} $是一个低载体密度半学，其运输属性表示行为上的金属非金属交叉。在整个调查温度范围内观察到了较大的Seebeck值，并且对$ S $和$ S/T $的温度变化分析显示，PR 4 $ F^2 $与Fermi水平附近的传导电子状态之间没有强烈相关的迹象。一个大的sommerfeld系数，$γ= 150 $ 〜mj/（mol k $^2 $）表明从动态晶体场波动中形成了中等重型铁状态。
We report the magnetic, electronic and transport properties of the quasi-skutterudite compound Pr$_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.
