Phys. Rev. Lett. 103, 155301 (2009) [4 pages]New Anomaly in the Transverse Acoustic Impedance of Superfluid 3He-B with a Wall Coated by Several Layers of 4HeReceived 5 March 2009; revised 18 September 2009; published 5 October 2009 We measured the transverse acoustic impedance of superfluid 3He-B with a wall coated by several layers of 4He. The coating is known to enhance the specularity in quasiparticle scattering by the wall. We found a new anomaly, a bump and a peak, in the temperature dependence of the transverse acoustic impedance. This agrees with a theoretical calculation using a partially specular wall boundary condition. The new anomaly is shown to arise from a change in the surface density of states by coating and the scattering of thermally occupied surface bound states to other states. The change is towards the density of states of Majorana cone in the specular limit. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.155301
DOI:
10.1103/PhysRevLett.103.155301
PACS:
67.30.hp, 43.58.+z, 67.90.+z, 74.45.+c
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