Measurement of the group velocity of 93 GHz phonons in liquid 4He |
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| Authors: | NA Lockerbie AFG Wyatt RA Sherlock |
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| Institution: | Department of Physics, University of Nottingham, University Park, Nottingham NG7 2Rd, England |
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| Abstract: | The group velocity of 93 GHz phonons in liquid 4He has been measured directly at T ? 0.1 K between 0 and 24 bar. Above ～ 12 bar the group velocity falls increasingly below the ultrasonic phase velocity, and at 24 bar the dispersion is consistent with the quadratic deviation below linearity as suggested by neutron scattering. |
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