论文标题
双极金属中的发散热膨胀和grüneisen比率
Divergent Thermal Expansion and Grüneisen Ratio in a Quadrupolar Kondo Metal
论文作者
论文摘要
我们报告了单突发性四极近近可杀伤者y $ _ $ _ $ _ {1-x} $ pr $ _ {x} $ ir $ _2 $ _2 $ _2 $ zn $ _ {20} $。在稀释限制中，我们找到了一个四极应变，该应变对温度$ t $，$ \ varepsilon _ {\ Mathrm {u}} \ sim H^2 \ log 1/t $，对于小而有限的磁场$ h $。与先前报道的异常热$ c $一起，这意味着四极grüneisen比率$γ_U= \ partial_t \ varepsilon _ {\ m atrm {\ mathrm {u}}/c \ sim h^2/（t^2 \ log log 1/t）的divergence是一致的，而n vivergence是一致的一致。此外，我们在零磁场中发现各向同性应变$ \ varepsilon _ {\ mathrm {b}} $的单一行为，从而导致体积热膨胀和体积Grüneisen参数的发散。我们推测，这种行为也可能是通过弹性非谐度或静态应变障碍来引起的。
We report on the low-temperature thermal expansion and magnetostriction of the single-impurity quadrupolar Kondo candidate Y$_{1-x}$Pr$_{x}$Ir$_2$Zn$_{20}$. In the dilute limit, we find a quadrupolar strain that possesses a singular dependence on temperature $T$, $\varepsilon_{\mathrm{u}} \sim H^2 \log 1/T$, for a small but finite magnetic field $H$. Together with the previously reported anomalous specific heat $C$, this implies a quadrupolar Grüneisen ratio $Γ_u = \partial_T \varepsilon_{\mathrm{u}}/C \sim H^2/(T^2 \log 1/T)$ whose divergence for finite $H$ is consistent with the scenario of a quadrupolar Kondo effect. In addition, we find a singular behavior of the isotropic strain $\varepsilon_{\mathrm{B}}$ in zero magnetic field resulting in a divergence of both the volume thermal expansion and the volume Grüneisen parameter. We speculate that this behavior might be also induced by putative Kondo correlations via elastic anharmonicities or static strain disorder.
