  We investigate the properties of composite fermions with four attached flux
quanta through tilted field experiments near Landau level filling factor nu =
3/4. The observed collapse of fractional quantum Hall gaps in the vicinity of
this quarter-filling state can be comprehensively understood in terms of
composite fermions with mass and spin. Remarkably, the effective mass and
g-factor of these four flux quanta composite fermions around nu = 3/4 are very
similar to those of two flux quanta composite fermions around nu = 3/2.

Mesoscale and Nanoscale Physics;Strongly Correlated Electrons