Abstract
Slow enhancements in the longitudinal resistance (R x x ) due to nuclear spin polarization are studied around Landau-level filling factors of ν=2/3 and 3/5 as functions of both the filling factor and magnetic field. The R x x enhancement appears not only at the ν=2/3 and 3/5 spin transitions observed around magnetic fields of B =6.9 and 8.6 T respectively, but also over extended regions at higher and lower magnetic fields along the flanks of the ν=2/3 and 3/5 quantum Hall states. Analyses based on the coincidence of spin-split Landau levels for composite fermions provide reasonable account of the R x x enhancements observed in a wide range of magnetic field.
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