De Haas-van Alphen Effect in an Icosahedral Quasicrystal
Abstract
We report new measurements of the de Haas-van Alphen effect, the magnetoresistance, and the magnetization of the icosahedral quasicrystal Al_70Pd_21.5Mn_8.5. The dHvA measurements were done in pulsed magnetic fields up to 50 T and temperatures down to 400 mK. We have found two prominent dHvA frequencies with the magnetic field parallel to a five-fold axis, and two different ones with the field parallel to a two-fold axis. The orbital areas are relatively large and comparable to the neck orbit of copper. We will propose a model for the Fermi surface of Al_70Pd_21.5Mn_8.5 and an interpretation of our results based on a magnetic breakdown model. On increasing the temperature, the amplitude of the oscillations substantially decreased, suggesting that the carriers have masses of the order of 25-50 m_e.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1996
- Bibcode:
- 1996APS..MAR.A2113H