Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4

Ş. G. Söyler; A. B. Kuklov; L. Pollet; N. V. Prokof'ev; B. V. Svistunov

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arXiv · 0908.4296

Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4

Ş. G. Söyler·A. B. Kuklov·L. Pollet·N. V. Prokof'ev·B. V. Svistunov

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Abstract

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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Ş. G. Söyler, A. B. Kuklov, L. Pollet, N. V. Prokof'ev, B. V. Svistunov. 2009-08-31. Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4. https://arxiv.org/abs/0908.4296

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