hydrostatic pressure作用下未掺杂YbRh $_2$ Si $_2$的能级分离
Separation of energy scales in undoped YbRh$_2$Si$_2$ under hydrostatic pressure
摘要：
通过低$T$磁化强度测量，研究了YbRh $_2$ Si $_2$在量子临界点附近的温度（$T$）-磁场（$H$）相图.我们的分析表明，能量标度$T^\star(H)$，以前与近藤击穿和终止于0.06 T的$T\to 0$，保持不变的压力下，而反铁磁临界场从0.06 T（$p=0$）增加到0.29 T（$p=1.28$ GPa），导致在交叉的$T_N(H)$和$T^\star(H)$。我们的结果与Yb（Rh $_{1-x}$ Co $_x$）$_2$ Si $_2$上的结果非常相似，证明了Co诱导的无序不是化学压力下两种尺度脱离的原因.
英文摘要：
The temperature ($T$)-magnetic field ($H$) phase diagram of YbRh$_2$Si$_2$ in the vicinity of its quantum critical point is investigated by low-$T$ magnetization measurements. Our analysis reveals that the energy scale $T^\star(H)$, previously related to the Kondo breakdown and terminating at 0.06 T for $T\to 0$, remains unchanged under pressure, whereas the antiferromagnetic critical field increases from 0.06 T ($p=0$) to 0.29 T ($p=1.28$ GPa), resulting in a crossing of $T_N(H)$ and $T^\star(H)$. Our results are very similar to those on Yb(Rh$_{1-x}$Co$_x$)$_2$Si$_2$, proving that the Co-induced disorder can not be the reason for the detachment of both scales under chemical pressure.
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