Abstract
Magnetotransport measurements of composite fermions (CF’s) are reported in 50-T pulsed magnetic fields. The CF effective mass is found to increase approximately linearly with the effective field , in agreement with our earlier work at lower fields. For a of 14 T it reaches 1.6, over 20 times the band-edge electron mass. Data from all fractions are unified by the single parameter for all the samples studied over a wide range of electron densities. The energy gap is found to increase like √B* at high fields.
- Received 30 August 1995
DOI:https://doi.org/10.1103/PhysRevB.53.2057
©1996 American Physical Society