Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4

Details Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4 Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4

2009-08-31

arxiv.org/abs/0908.4296v1

Phys.Rev.Lett. {\bf 103}, 175301(2009)

Physics

Condensed Matter

Other Condensed Matter

4 revtex pages with 3 ps figures

Scientific paper

In the experiment on superfluid transport in solid He4 [PRL {\bf 100}, 235301 (2008)], Ray and Hallock observed an {\it anomalously large isochoric compressibility}: the supersolid samples demonstrated a significant and apparently spatially uniform response of density and pressure to chemical potential, applied locally through Vycor "electrodes". We propose that the effect is due to {\it superclimb} : edge dislocations can climb because of mass transport along superfluid cores. We corroborate the scenario by {\it ab initio} simulations of an edge dislocation in solid He4 at $T=0.5K$. We argue that at low temperature the effect must be suppressed due to a crossover to the smooth dislocation.

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