Separation of Energy Scales in Undoped YbRh<sub>2</sub>Si<sub>2</sub>Under Hydrostatic Pressure
Separation of Energy Scales in Undoped YbRh<sub>2</sub>Si<sub>2</sub>Under Hydrostatic Pressure
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 …