Ultrasonic investigation of rotating3He-B in strong magnetic fields

✍ Scribed by A.J. Manninen; J.M. Kyynarainen; K. Torizuka; J.P. Pekola

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 241 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(90)81184-p

✦ Synopsis

We have studied ultrasonic attenuation in rotating sHe-B at low pressures (< 10 bar) in magnetic fields up to 300 mT. In a strong field, the energy gap A in sHe-B is anisotropic, and the attenuation a of zero sound depends on the orientation of A. Because vortices and the counterflow between the normal and superfluid components of the liquid turn the anisotropy axis of A, a clear dependence of cc on the rotation velocity Q can be observed. The magnitude of this response is not a linear, sometimes not even a monotonic function of R. Its dependence on the magnetic field is anomalous around H = 200 mT. We have also observed a metastable state in rotating sHe-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.