Unusual behavior of the low-moment magnetic ground state of YbRh2Si2 under high pressure
Unusual behavior of the low-moment magnetic ground state of YbRh2Si2 under high pressure
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高压下 YbRh2Si2 低矩磁基态的异常行为
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
F. Steglich
中科院分区：
文献类型：
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作者：
J. Plessel;M. Abd;J. Sanchez;G. Knebel;C. Geibel;O. Trovarelli;F. Steglich
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 $ensuremath{approx}10mathrm{GPa}$ 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.
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 $ensuremath{approx}10mathrm{GPa}$ 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.