title: Underlying mechanism for the giant isochoric compressibility of solid (4)He: superclimb of dislocations[ corrected].
abstract: 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.
authors.affiliation: Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.
authors.forename: S G
authors.initials: SG
authors.lastname: Söyler
authors.forename: A B
authors.initials: AB
authors.lastname: Kuklov
authors.forename: L
authors.initials: L
authors.lastname: Pollet
authors.forename: N V
authors.initials: NV
authors.lastname: Prokof'ev
authors.forename: B V
authors.initials: BV
authors.lastname: Svistunov