Measurements of the temperature dependence of the bubble phase

We examine the temperature dependence of the bubble phase using the resonance in the real diagonal conductivity, Re{[}sigma(xx)], discovered recently by Lewis et al. (Phys. Rev. Lett. 89 (2002) 136804). The peak frequency, f(pk), of the resonance at base temperature of 30 mK is as much as 50% larger than at the highest temperature where a resonance is discernable. The resonance vanishes above a temperature of 80-100 mK. (C) 2003 Elsevier B.V. All rights reserved.