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We have measured the diagonal conductivity in the microwave regime of anultrahigh mobility two dimensional electron system. We find a sharp resonancein Re[sigma_{xx}] versus frequency when nu > 4 and the partial filling of thehighest Landau level, nu^*, is ~ 1/4 or 3/4 and temperatures < 0.1 K. Theresonance appears for a range of nu^* from 0.20 to 0.37 and again from 0.62 to0.82. the peak frequency, f_{pk} changes from ~ 500 to ~ 150 as nu^* = 1/2 isapproached. This range of f_{pk} shows no dependence on nu where the resonanceis observed. The quality factor, Q, of the resonance is maximum at ~ nu^* =0.25 and 0.74. We interpret the resonance as due to a pinning mode of thebubble phase crystal.Comment: revtex 4, 3 figures, minor corrections made. Accepted by pr

physical review letters

Microwave Resonance of the Bubble Phases in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>4</mml:mn></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>3</mml:mn><mml:mo>/</mml:mo><mml:mn>4</mml:mn></mml:math>Filled High Landau Levels

Microwave Resonance of the Bubble Phases in1/4and3/4Filled High Landau Levels