A heavy fermion superconductor UPt3 exhibits the metamagnetic transition at about 20 T. High-field magnetization experiments reveal that this transition persists up to about 30 K, which is close to the characteristic temperature Tχmax (=20 K) where the magnetic susceptibility has a maximum in the temperature dependence. Below Tχmax, the magnitude of magnetic fluctuations increases and forms the heavy fermion state at low temperatures. This is reflected in the growth of the cyclotron effective mass. The mass in the main band 37-electron Fermi surface, which was determined by the de Haas-van Alphen experiments, is strongly enhanced with increasing the field, from 63m0 at 12.5 T to 86m0 at 18 T. This is consistent with the field dependence of the electronic specific heat coefficient.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1999 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics