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 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. 
A. S. Yeh (1), H. L. Stormer (2,3), D. C. Tsui (1,4), L. N. Pfeiffer   (2), K. W. Baldwin (2), and K. W. West (2) ((1) Dept....