EVALUATION OF TEMPERATURE-VARIATION OF THE PRESSURE-DEPENDENT ZERO-SOUND VELOCITIES IN LIQUID-HE-3

Using the phonon part of the effective Hamiltonian of Mishra and Tripa thy (J Low Temp Phys, 75 (1989) 79), variation of pressure dependent z ero-sound velocities has been studied. We have calculated the pressure dependent zero-sound velocities by using the contact interaction pote ntial and pseudopotential of Aldrich and Pines. Our calculated values of pressure dependent zero-sound velocities are in a good agreement wi th the experimental data of Abraham and Osborue. By considering the ef fects of damping of the zero-sound mode, we have been able to explain satisfactorily the variation of zero-sound velocity with temperature T <1500 mK.