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Title: Measurement of the Kinetic Energy and Lattice Constant in hcp Solid Helium at Temperatures 0.07-0.4 K

Abstract

The single atom kinetic energy {kappa} of high purity solid hcp {sup 4}He has been measured by neutron Compton scattering, at temperatures between 0.07 and 0.4 K and a pressure of 40 bar. Within statistical error of {approx}2% no change in {kappa} was observed. The values of {kappa} at {approx}0.07 K were the same in a single crystal and a polycrystalline sample and were also unaffected (within statistical error) by the addition of 10 ppm of {sup 3}He. The lattice constant was also found to be independent of temperature to within 1 part in 2000. These results suggest that the supersolid transition in {sup 4}He has a different microscopic origin to the superfluid transition in the liquid.

Authors:
; ; ;  [1]
  1. ISIS Facility, Rutherford Appleton Laboratory, Chilton, OX11 0QX (United Kingdom)
Publication Date:
OSTI Identifier:
20957686
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevLett.98.085301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPTON EFFECT; ERRORS; HCP LATTICES; HELIUM; HELIUM 3; HELIUM 4; IMPURITIES; KINETIC ENERGY; LATTICE PARAMETERS; MONOCRYSTALS; NEUTRON DIFFRACTION; POLYCRYSTALS; SUPERFLUIDITY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K

Citation Formats

Adams, M. A., Mayers, J., Kirichek, O., and Down, R. B. E. Measurement of the Kinetic Energy and Lattice Constant in hcp Solid Helium at Temperatures 0.07-0.4 K. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.085301.
Adams, M. A., Mayers, J., Kirichek, O., & Down, R. B. E. Measurement of the Kinetic Energy and Lattice Constant in hcp Solid Helium at Temperatures 0.07-0.4 K. United States. doi:10.1103/PHYSREVLETT.98.085301.
Adams, M. A., Mayers, J., Kirichek, O., and Down, R. B. E. Fri . "Measurement of the Kinetic Energy and Lattice Constant in hcp Solid Helium at Temperatures 0.07-0.4 K". United States. doi:10.1103/PHYSREVLETT.98.085301.
@article{osti_20957686,
title = {Measurement of the Kinetic Energy and Lattice Constant in hcp Solid Helium at Temperatures 0.07-0.4 K},
author = {Adams, M. A. and Mayers, J. and Kirichek, O. and Down, R. B. E.},
abstractNote = {The single atom kinetic energy {kappa} of high purity solid hcp {sup 4}He has been measured by neutron Compton scattering, at temperatures between 0.07 and 0.4 K and a pressure of 40 bar. Within statistical error of {approx}2% no change in {kappa} was observed. The values of {kappa} at {approx}0.07 K were the same in a single crystal and a polycrystalline sample and were also unaffected (within statistical error) by the addition of 10 ppm of {sup 3}He. The lattice constant was also found to be independent of temperature to within 1 part in 2000. These results suggest that the supersolid transition in {sup 4}He has a different microscopic origin to the superfluid transition in the liquid.},
doi = {10.1103/PHYSREVLETT.98.085301},
journal = {Physical Review Letters},
number = 8,
volume = 98,
place = {United States},
year = {Fri Feb 23 00:00:00 EST 2007},
month = {Fri Feb 23 00:00:00 EST 2007}
}