Surface Specific Heat of $^{3}$He and Andreev Bound States

TL;DR

This study measures the specific heat of liquid helium-3 near a silver surface to identify Andreev bound states, revealing surface quasiparticle behavior close to the superfluid transition.

Contribution

It provides high-resolution data linking surface-specific heat contributions to Andreev bound states in helium-3, a novel experimental insight.

Findings

Surface contribution to heat capacity identified with Andreev bound states.

Measured specific heat near superfluid transition at various pressures.

Evidence of quasiparticle states with a range of half a coherence length.

Abstract

High resolution measurements of the specific heat of liquid $^{3}$He in the presence of a silver surface have been performed at temperatures near the superfluid transition in the pressure range of 1 to 29 bar. The surface contribution to the heat capacity is identified with Andreev bound states of $^{3}$He quasiparticles that have a range of half a coherence length.