Lattice dynamics of negative thermal expansion in ScF3

ORAL

Abstract

We present inelastic scattering spectroscopy of single-crystalline samples of negative thermal expansion material ScF3 to investigate the dispersion of lattice excitations in this unusual system. The spectra reveal important mechanistic information regarding the negative thermal expansion and show that a large class of fluorides can accommodate unconventional lattice dynamics. The connections to nonlinear and distinctly quantum phenomena will be discussed.

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Authors

  • Jason Hancock

    • University of Connecticut

  • Sahan Handunkanda

    • University of Connecticut

  • Ayman Said

    • Argonne National Laboratory

  • Bogdan Leu

    • Argonne National Laboratory

  • Vladimir Voronov

    • Kirenskii Institute of Physics, Siberia