Crossover between Fermi liquid and non-Fermi liquid behavior in the non-centrosymmetric compound Yb₂Ni₁₂P₇

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A crossover from a non-Fermi liquid to a Fermi liquid phase in Yb₂Ni₁₂P₇ is observed by analyzing electrical resistivity ρ(T), magnetic susceptibility χ(T), specific heat C(T), and thermoelectric power S(T) measurements. The electronic contribution to specific heat, Cₑ(T), behaves as Cₑ(T)/T -(T) for 5 K < T < 15 K, which is consistent with non-Fermi liquid behavior. Below T 4 K, the upturn in Cₑ(T)/T begins to saturate, suggesting that the system crosses over into a Fermi-liquid ground state. This is consistent with robust ρ(T) - ρ₀ = AT² behavior below T 4 K, with the power-law exponent becoming sub-quadratic for T > 4 K. A crossover between Fermi-liquid and non-Fermi liquid behavior suggests that Yb₂Ni₁₂P₇ is in close proximity to a quantum critical point, in agreement with results from recent measurements of this compound under applied pressure.