Pressure effect of transport properties of hexagonal Yb₂Ni₁₂P₇

We prepared single crystals of Yb₂Ni₁₂P₇ using a Sn-flux method and measured their resistivity under hydrostatic pressure up to 8 GPa. At ambient pressure, the magnetic part of resistivity ρ_mag(T) shows a peak around T_max ~ 100 K and T² dependence below the characteristic temperature of the Fermi liquid, T_FL = 3 K. When pressure increases up to 2.06 GPa, the value ρ_mag(T) above T_max decreases slightly but ρ_mag below T_max increases slightly. T_FL decreases with increasing pressure, and is expected to become zero at 2.5 GPa. Around this pressure, the coefficient of T² in ρ_mag significantly increases, suggesting the existence of a quantum critical point. Above 2.5 GPa, overall ρ_mag gradually decreases with increasing pressure up to 6 GPa, but it below 15.5 K increases above 6 GPa.