Fermi Surface of CeRu2within Local-Density Functional Theory

Abstract

The Fermi surface is investigated for the heavy-electron compound CeRu 2 , which is known as a type-II superconductor exhibiting anomalous magnetic properties, on the basis of the itinerant-electron model for the 4 f electrons. The energy band structure is calculated by a relativistic linear augmented-plane-wave method with the exchange-correlation potential in the local-density approximation. The Fermi surface is found to consist of a set of six small hole pockets, a large multiply-connected hole sheet and a set of three complex electron sheets and a set of three small electron pockets. Recent experimental results for the de Haas-van Alphen effect are explained reasonably well in terms of the large hole sheet and the small electron pockets except for the cyclotron effective mass. It seems that many frequency branches may have been missed in the experiment. A nesting property of the Fermi surface is also investigated.