Stability of superflow

Journal Article · Sun May 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.12087· OSTI ID:5006992

Soininen, P I; Kopnin, N B ^[1]

---

1. Low Temperature Laboratory, Helsinki University of Technology, 02150 Espoo (Finland)

The stability of uncharged superflow is studied within the Ginzburg-Landau theory. The linear-stability problem for flow in the presence of a flat wall is solved analytically. We prove that the critical velocity is not modified from its value for homogeneous superflow if the order parameter is required to vanish at the wall. We further show that surface roughness on the scale of the coherence length does have a strong effect on the stability of the flow. The critical velocity in the vicinity of a two-dimensional surface bump'' is well described by a power law for the parameter values considered.

• OSTI ID: 5006992
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:17; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL VELOCITY
ELEMENTS
FLUID FLOW
FLUIDS
GASES
GINZBURG-LANDAU THEORY
HELIUM
NONMETALS
RARE GASES
ROUGHNESS
STABILITY
SUPERFLUIDITY
SURFACE PROPERTIES
VELOCITY
VORTICES
WALLS