Abstract
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 ρmag(T) shows a peak around Tmax ~ 100 K and T2 dependence below the characteristic temperature of the Fermi liquid, TFL = 3 K. When pressure increases up to 2.06 GPa, the value ρmag(T) above Tmax decreases slightly but ρmag below Tmax increases slightly. TFL decreases with increasing pressure, and is expected to become zero at 2.5 GPa. Around this pressure, the coefficient of T2 in ρmag significantly increases, suggesting the existence of a quantum critical point. Above 2.5 GPa, overall ρmag gradually decreases with increasing pressure up to 6 GPa, but it below 15.5 K increases above 6 GPa.
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