A high-resolution acoustic impedance technique has been used to investigate the collective-mode spectrum of He3-A near Tc. A new collective mode of the order parameter has been observed. The temperature at which the new mode appears is frequency, pressure, and magnetic field independent. The observed temperature dependence is very close to the predicted behavior of the super-flapping mode in the weak-coupling limit of the Anderson-Brinkman-Morel energy gap.
ASJC Scopus subject areas
- Physics and Astronomy(all)