Critical Ultrasonics Near the Superfluid Transition : Finite Size Effects

Details Critical Ultrasonics Near the Superfluid Transition : Finite Size Effects Critical Ultrasonics Near the Superfluid Transition : Finite Size Effects

1998-03-20

arxiv.org/abs/cond-mat/9803243v1

Physics

Condensed Matter

10 pages (LaTeX), 1 figure (PostScript)

Scientific paper

10.1088/0305-4470/31/34/001

The suppression of order parameter fluctuations at the boundaries causes the ultrasonic attenuation near the superfluid transition to be lowered below the bulk value. We calculate explicitly the first deviation from the bulk value for temperatures above the lambda point. This deviation is significantly larger than for static quantities like the thermodynamic specific heat or other transport properties like the thermal conductivity. This makes ultrasonics a very effective probe for finite size effects.

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