X-ray studies of low-temperature solid 4He

C. A. Burns, N. Mulders, L. Lurio, Moses Hung-Wai Chan, A. Said, C. N. Kodituwakku, P. M. Platzman

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Recent measurements have found nonclassical rotational inertia (NCRI) in solid 4He starting at T∼200 mK, leading to speculation that a supersolid state may exist in these materials. Differences in the NCRI fraction due to the growth method and annealing history imply that defects play an important role in the effect. Using x-ray synchrotron radiation, we have studied the nature of the crystals and the properties of the defects in solid 4He at temperatures down to 50 mK. Measurements of peak intensities and lattice parameters do not show indications of the supersolid transition. Using growth methods similar to those of groups measuring the NCRI, we find that large crystals (dimensions∼millimeters) form. Scanning with a small (down to 10×10 μ m2) beam, we resolve a mosaic structure within these crystals, which is consistent with small-angle grain boundaries. The mosaic shows significant shifts over time even at temperatures far from melting. We discuss the relevance of these defects to the NCRI observations.

Original languageEnglish (US)
Article number224305
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number22
DOIs
StatePublished - Dec 1 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'X-ray studies of low-temperature solid <sup>4</sup>He'. Together they form a unique fingerprint.

  • Cite this

    Burns, C. A., Mulders, N., Lurio, L., Chan, M. H-W., Said, A., Kodituwakku, C. N., & Platzman, P. M. (2008). X-ray studies of low-temperature solid 4He. Physical Review B - Condensed Matter and Materials Physics, 78(22), [224305]. https://doi.org/10.1103/PhysRevB.78.224305