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The effect of pressure on the unique electronic state of theantiferromagnetic (AF) compound EuCu2Ge2 has been measured in a widetemperature range from 10 mK to 300 K by electrical resistivity measurements upto 10 GPa. The Neel temperature of TN = 15 K at ambient pressure increasesmonotonically with increasing pressure and becomes a maximum of TN = 27 K at6.2 GPa but suddenly drops to zero at Pc = 6.5 GPa, suggesting the quantumcritical point (QCP) of the valence transition of Eu from a nearly divalentstate to that with trivalent weight. The rhomag0 and A values obtained from thelow-temperature electrical resistivity based on the Fermi liquid relation ofrhomag = rhomag0 + AT^2 exhibit huge and sharp peaks around Pc. The exponent nobtained from the power law dependence rhomag = rhomag0 + BT^n is clearly lessthan 1.5 at P = Pc = 6. 5 GPa, which is expected at the AF-QCP. These resultsindicate that Pc coincides with Pv, corresponding to the quantum criticality ofthe valence transition pressure Pv. The electronic specific heat coefficient,estimated from the generalized Kadowaki-Woods relation, is about 510 mJ/mol K^2around Pc, suggesting the formation of a heavy-fermion state.

Quantum Criticality of Valence Transition for the Unique Electronic State of Antiferromagnetic Compound EuCu2Ge2