Fermi Surface, Magnetic and Superconducting Properties of LaRhIn₅ and CeTIn₅ (T: Co, Rh and Ir)

Abstract

We have studied Fermi surface properties of LaRhIn 5 and CeTIn 5 (T: Co, Rh and Ir) via the de Haas–van Alphen (dHvA) experiment. The Fermi surface of a non-4 f reference compound LaRhIn 5 is quasi-two dimensional, reflecting the unique tetragonal crystal structure, which is consistent with the result of FLAWP energy band calculations. The Fermi surface of an antiferromagnet CeRhIn 5 is similar to that of LaRhIn 5 , although the cyclotron mass in CeRhIn 5 is roughly by one order larger than that in LaRhIn 5 . Both Fermi surfaces are, however, different from those of CeCoIn 5 and CeIrIn 5 which are well explained by the 4 f -itinerant band model. The 4 f electrons in CeRhIn 5 thus do not contribute to the volume of the Fermi surface. We have also studied magnetic and superconducting properties of CeCoIn 5 and CeIrIn 5 .