Fig. 6

Magnetoresistance in the second Landau level of sample B in the ambient. Traces are measured at ambient pressure and at T ≈ 4.5 mK. The strong resistance anisotropy at ν = 7/2 shows a nematic ground state, while at ν = 5/2 we observe a FQHS. The nature of the ground state at these two filling factors is marked by text