Coexistence of superfluid and solid helium in aerogel

The results of recent neutron scattering studies of solid helium in silica aerogel are discussed. Previously I.V. Kalinin et al., Pis’ma Zh. Éksp. Teor. Fiz. 87 (1), 743 (2008) [JETP Lett. 87 (1), 645 (2008)], we detected the existence of a superfluid phase in solid helium at a temperature below 0.6...

Full description

Saved in:
Bibliographic Details
Published in:Journal of experimental and theoretical physics 2010-08, Vol.111 (2), p.215-219
Main Authors: Kalinin, I. V., Kats, E. I., Koza, M., Lauter, V. V., Lauter, H., Puchkov, A. V.
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
COHERENT SCATTERING
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIAGRAMS
DIFFRACTION
Disorder
Elementary Particles
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
HELIUM
INFORMATION
LIFETIME
MINERALS
NEUTRON DIFFRACTION
NONMETALS
Order
OXIDE MINERALS
Particle and Nuclear Physics
PHASE DIAGRAMS
PHASE STABILITY
PHASE STUDIES
PHASE TRANSFORMATIONS
Phase Transition in Condensed System
Physics
Physics and Astronomy
PRESSURE DEPENDENCE
Quantum Field Theory
RARE GASES
Relativity Theory
SCATTERING
SILICA
Solid State Physics
SOLIDS
STABILITY
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The results of recent neutron scattering studies of solid helium in silica aerogel are discussed. Previously I.V. Kalinin et al., Pis’ma Zh. Éksp. Teor. Fiz. 87 (1), 743 (2008) [JETP Lett. 87 (1), 645 (2008)], we detected the existence of a superfluid phase in solid helium at a temperature below 0.6 K and a pressure of 51 bar, although, according to the phase diagram, helium should be in the solid state under these conditions. This work is a continuation of the above studies whose main goal was to examine the detected phenomenon and to establish basic parameters of the existence of a superfluid phase. We have determined the temperature of the superfluid transition from solid to superfluid helium, T C = 1.3 K, by analyzing experimental data. The superfluid phase excitation parameters (lifetime, intensity, and energy) have a temperature dependence similar to that of bulk helium. The superfluid phase coexists with the solid phase in the entire measured temperature range from T = 0.05 K to T C and is a nonequilibrium one and disappears at T C .
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776110080091