Recent Advances in Ce-Based Heavy-Fermion Superconductivity and Fermi Surface Properties

We present the recent advances in Ce-based heavy fermion superconductivity. Heavy fermions are formed by the competition between the Ruderman–Kittel–Kasuya–Yosida interaction and the Kondo effect. The application of pressure is useful for controlling the electronic states in antiferromagnets such as CeRh 2 Si 2 , Ce 2 Ni 3 Ge 5 , CeIn 3 , CeRhIn 5 , and CeIrSi 3 . For these compounds, the Néel temperature T N decreases with increasing pressure and reaches zero at the quantum critical pressure P c . Superconductivity appears around P c . In CeRu 2 , CeCoIn 5 , and CePt 3 Si, superconductivity is realized at ambient pressure. For these pressure-induced and ambient-pressure superconductors, we clarified their unconventional characteristics of superconductivity, the close relationship between superconductivity and the dimensionality of the electronic states, and a new aspect of superconductivity in the non-centrosymmetric crystal structure, together with its Fermi surface instability at P c .