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Detailed measurements of the longitudinal thermopower of two-dimensionalelectrons in the first excited Landau level are reported. Clear signatures ofnumerous fractional quantized Hall states, including those at $\nu = 5/2$ and7/3, are observed in the magnetic field and temperature dependence of thethermopower. An abrupt collapse of the thermopower is observed below about $T=40$ mK at those filling factors where re-entrant insulating electronic stateshave been observed in conventional resistive transport studies. The thermopowerobserved at $\nu = 5/2$ is discussed in the context of recent theories whichincorporate non-abelian quasiparticle exchange statistics.

Thermoelectric response of fractional quantized Hall and re-entrant insulating states in the N=1 Landau level