Abstract
We measured the electrical resistivity in magnetic field H under pressure P for a heavy fermion compound YbIr2Zn20. The quantum critical point is found to be defined as an electronic state where the metamagnetic transition field Hm becomes zero. This is realized at Pc ≊ 5.2 GPa. The most characteristic feature in the quantum critical pressure region is an anomalously large A value of the electrical resistivity p = p0 + AT2, reaching A = 380μΩ·cm/K2 at 5.0 GPa, which is, however, strongly reduced with increasing the magnetic field: A = 1.45μΩ·cm/K2 at 80 kOe. From the result of the de Haas-van Alphen experiment at ambient pressure, the corresponding cyclotron effective mass of conduction electrons at 5.0 GPa is 400 – 500 m0 (m0: rest mass of an electron).
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