Two-Dimensional Interface Excitations: Measurements inHe3-He4Mixtures

Abstract

The experimental data which we have gathered on the superfluid mass content in films of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ mixtures yield a characteristic length which varies markedly both with temperature and ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ concentration. The data are analyzed to present their implications on the energy gap and on other parameters characterizing the two-dimensional helium-boundary-interface excitation spectrum.