Effect of pressure on transport properties of CeIrIn5

Abstract

Electrical resistivity ρ and thermoelectric power S of a heavy-fermion superconductor CeIrIn5 have been measured at temperatures from 2.0 K to 300 K under hydrostatic pressures up to 2.2 GPa. The thermoelectric power S exhibits a large positive value up to 90 μV/K, which is characteristic of heavy-fermion systems. S also shows a sharp maximum in its temperature dependence and its maximum temperature Ts, max increases with pressure, while its maximum value is constant independent of pressure. These experimental results strongly indicate that the Kondo temperature of CeIrIn 5 increases by applying the pressure. © Published under licence by IOP Publishing Ltd.