Abstract
High-pressure investigations of the ground state properties of the non-Fermi-liquid system ${\mathrm{YbRh}}_{2}{\mathrm{Si}}_{2}$ ${(}^{170}\mathrm{Yb}$-M\"ossbauer effect, electrical resistance and x-ray diffraction) reveal unusual features that are different from those found in Ce-related systems. We show that the ordered state with a low magnetic moment persists in a very large pressure range up to $\ensuremath{\approx}10\mathrm{GPa}$ and is associated with spin fluctuations. At 10 GPa the system undergoes a first-order magnetic phase transition to a high-moment state with ${\ensuremath{\mu}}_{\mathrm{Yb}}=1.9(1){\ensuremath{\mu}}_{B}$ and magnetic ordering temperature ${T}_{m}=7.5(4)\mathrm{K}$ at 16.5 GPa. A magnetic phase diagram for ${\mathrm{YbRh}}_{2}{\mathrm{Si}}_{2}$ in the $(p,T)$ space is suggested.
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