Underlying mechanism for the giant isochoric compressibility of solid (4)He: superclimb of dislocations[ corrected].
In the experiment on superfluid transport in solid 4He [Phys. Rev. Lett. 100, 235301 (2008)], Ray and Hallock observed an 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 superclimb: edge dislocations can climb because of mass transport along superfluid cores. We corroborate the scenario by ab initio simulations of an edge dislocation in solid 4He at T = 0.5 K. We argue that at low temperature the effect must be suppressed due to a crossover to the smooth dislocation.
Söyler
S G
SG
Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Kuklov
A B
AB
Pollet
L
L
Prokof'ev
N V
NV
Svistunov
B V
BV