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High frequency (ac) conductivity in the single quantum wellAlGaAs/GaAs/AlGaAs with high mobility was investigated by contactless acousticmethods in the fractional quantum Hall effect regime in perpendicular andtilted magnetic fields. We studied the dependence of ac conductivity$\sigma^{ac}=\sigma_1 - i\sigma_2$ on both the temperature and magnetic fieldtilt angle. Tilting the magnetic field relative to the sample surface enabledus to change the position of the conductivity oscillation minimum at $\nu$=2/3.We measured the temperature dependence of ac conductivity for each tilt angleand for the 2/3 state we calculated the activation energy $\Delta E$ which wasderived by constructing the Arrhenius plot ln $\sigma_1$ against 1/$T$.Analyzing behavior of the activation energy in total magnetic field for thefilling factor 2/3 we observed a distinct minimum which can be interpreted asthe spin unpolarized-polarized phase transition.

Surface Acoustic Waves Probe of the Spin Phase Transition at $\nu$=2/3 in n-GaAs/AlGaAs structure