de Haas-van Alphen study of the mixed-valence compound YbCoIn5


de Haas-van Alphen study of the mixed-valence compound YbCoIn5

Polyakov, A.; Ignatchik, O.; Bianchi, A.; Prevost, B.; Seyfarth, G.; Fisk, Z.; Hurt, D.; Goodrich, R. G.; Wosnitza, J.

The interplay between conduction and localized electrons in mixed-valence materials has received great attention and remain to be a hot topic. The de Haas-van Alphen (dHvA) technique in combination with band-structure calculations is one of the best methods to investigate the multiband Fermi surfaces inherently present in these compounds. Here, we present a dHvA study of the nonmagnetic mixed-valence compound YbCoIn5. This material has the same crystal structure as the heavy-fermion superconductors CeCoIn5 and CeIrIn5 [1,2]. Our dHvA measurements thus allow a comparative investigation of the electronic properties of these highly interesting isostructural compounds. The dHvA signal was measured by use of a capacitive torque cantilever in a He3 cryostat in fields up to 13 T as well as in a dilution refrigerator down to 20 mK and up to 18 T. A number of different dHvA branches could be resolved. Besides their angular dependence, we as well determined the effective masses of the different bands by following the temperature-dependent amplitude change of the dHvA oscillations. In contrast to the heavy fermions CeCoIn5 and CeIrIn5, the effective masses for YbCoIn5 are in the range from 0.7 to 2.0 m0.

  • Poster
    RHMF09 (Research in High Magnetic Fields 2009), 22.-25.07.2009, Dresden, Deutschland

Permalink: https://www.hzdr.de/publications/Publ-13035
Publ.-Id: 13035