Separation of Energy Scales in Undoped YbRh2Si2 Under Hydrostatic Pressure

概要

論文の詳細を見る
The temperature–magnetic field ($T$–$H$) phase diagram of YbRh2Si2 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 $T\rightarrow 0$, 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 $T_{\text{N}}(H)$ and $T^{\star}(H)$. Our results are very similar to those on Yb(Rh1-xCox)2Si2, proving that the Co-induced disorder can not be the reason for the detachment of both scales under chemical pressure.
Physical Society of Japanの論文
2009-12-15