Heavy fermions in cerium and uranium compounds studied by the de Haas–van Alphen experiment

Abstract

We carried out the de Haas–van Alphen (dHvA) experiment under pressure to clarify the nature of f-electron compounds of CeRh 2Si 2, UGe 2 and CeCoIn 5. With increasing pressure, the Néel temperature T N =36 K in CeRh 2Si 2 and the Curie temperature T C =52 K in UGe 2 decrease, and a quantum critical point corresponding to the extrapolation T N or T C→0 is reached at the critical pressure p c≃1.06 and 1.52 GPa, respectively. Experimental results indicate a discontinuous change of the Fermi surface in CeRh 2Si 2 and UGe 2 when the pressure crosses p c. A heavy fermion superconductor CeCoIn 5 with a quasi-two dimensional Fermi surface was found to be located in the vicinity of the quantum critical point.