| Zdroj: |
Manninen, A J, Kyynarainen, J M, Torizuka, K & Pekola, J P 1990, ' Ultrasonic investigation of rotating 3 He-B in strong magnetic fields ', Physica B: Physics of Condensed Matter, vol. 165-166, no. PART 1, pp. 669-670 . https://doi.org/10.1016/S0921-4526(90)81184-P |
| Popis: |
We have studied ultrasonic attenuation in rotating 3He-B at low pressures (< 10 bar) in magnetic fields up to 300 mT. In a strong field, the energy gap Δ in 3He-B is anisotropic, and the attenuation α of zero sound depends on the orientation of Δ. Because vortices and the counterflow between the normal and superfluid components of the liquid turn the anisotropy axis of Δ, a clear dependence of α on the rotation velocity Ω can be observed. The magnitude of this response is not a linear, sometimes not even a monotonic function of Ω. Its dependence on the magnetic field is anomalous around H = 200 mT. We have also observed a metastable state in rotating 3He-B, which can be created by rotating the sample while cooling through the AB-transition. The lifetime of this state is on the order of 10 minutes. |
