We investigate the properties of composite fermions with four attached flux quanta through tilted-field experiments near Landau level filling factor ν0ex0ex=0ex0ex3/4. 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 ν0ex0ex=0ex0ex3/4 are very similar to those of two-flux-quanta composite fermions around ν0ex0ex=0ex0ex3/2.
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Yeh et al. (1999) studied this question.
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