Effective Mass and g-Factor of Four Flux Quanta Composite Fermions

We investigate the properties of composite fermions with four attached flux quanta through tilted field experiments near Landau level filling factor v=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 v=3/4 are very similar to those of two flux quanta composite fermions around v=3/2.