Abstract
In this work we present careful measurements of the resonance lines in the A phase performed in a closed, parallel plate geometry. The linewidths are in good agreement with the recent relaxation theories, except near the transition temperature. The satellite longitudinal resonance at a frequency 1/√2 times that of the usual mode, first identified by the Orsay group, is found to depend upon geometry. Finally, the integrals of both the transverse and longitudinal resonance lines fail to satisfy the Kramers-Krönig rule for the total intensity and are too small by roughly a factor of two.
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Work supported by the National Science Foundation through grant no. GH-38785 and DMR 72-03210 A01. Additional support was received through the Cornell Materials Science Center.
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Gully, W.J., Gould, C.M., Richardson, R.C. et al. An investigation of longitudinal and transverse resonance in superfluid3He-A in low magnetic fields. J Low Temp Phys 24, 563–577 (1976). https://doi.org/10.1007/BF00657167
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DOI: https://doi.org/10.1007/BF00657167