Fig. 4: Composite Fermion effective mass at and close to 5/2 filling factor.

Our estimated effective mass values (in units of bare electron mass) obtained from the limiting value of C/T are shown versus ν^*, and are compared with previous measured values in the first Landau level. At exact filling fraction ν = 5/2, three values are reported since the effective mass m^* was estimated from three distinct specific heat datasets. The original data (cyan diamond) from ref. ¹⁸ is shown with p_CF = 1 together with p_CF = 0.13 upon the analysis of Cooper et al.²¹ (red square). In the most recent thermopower work at ν = 1/2 by Liu et al.¹⁹, p_CF = 0 was used (yellow circle). The error bars of the first Landau level are the previously reported values results, see refs. ^18,19,21.