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Specific heat and electronic transport properties of medium heavy-fermion compound U2Rh2In

We report on measurements of the temperature dependent specific heat, resistivity, Seebeck and Hall coefficients of U2Rh2In. This compound does not order magnetically down to 1.5 K and is characterized by an enhanced electronic-heat coefficient γ≈130 mJ/mol U K2 at 2 K. The magnetic resistivity shows a T3/2 law below 4 K and a broad maximum at Tmaxρ = 55 K. The latter refers to the onset of coherence between U ions. The application of pressures up to 19 kbar diminishes the contribution of the spin fluctuation to the resistivity, but does not significantly change the position of the resistivity maximum. Thermopower is characterized by a deep minimum of −30 µV K−1 at 10 K, followed by a sign change at 45 K. The Hall coefficient shows a maximum at ∼Tmaxρ and is dominated by skew scattering. At 2 K, the ordinary Hall coefficient R0≈9.65 × 10−10 m3 C−1 corresponds in a one-band model to a charge carrier density of 1.33 holes/formula unit. The effective mass of the carriers at low temperatures is estimated to be 55me.