Superconducting Properties of CeRu2

We have measured the specific heat and the magnetization in the superconducting mixed state of CeRu 2 at low temperatures and in high magnetic fields. We have clarified a rich variety of superconducting properties such as the temperature dependence of the electronic specific heat and Maki parameters κ 1 , κ 2 and κ 3 . From these experimental results, CeRu 2 is concluded to be of the BCS-type in superconductivity. Nevertheless, interesting is the magnetic field dependence of the electronic specific heat at 0.5 K, indicating a \(√H\) like behavior in low fields and a H -linear dependence in high fields up to the upper critical field of 50 kOe. This characteristic specific heat is discussed on the basis of a microscopic theory by Brandt et al.