• Focussing and defocussing of ballistic phonons in diamond and Nb3Sn

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      https://www.ias.ac.in/article/fulltext/pram/024/06/0875-0886

    • Keywords

       

      Acoustic phonons; focussing; defocussing; mapping of phonons; polar Schmidtnet; impenetrable regions

    • Abstract

       

      The ballistic propagation of phonons in diamond and Nb3Sn at 40 and at 4.2 K is examined. The nature of variation of the phonon magnification factor has been analysed both in the wave vector as well as group velocity spaces. Using the Polar Schmidt-net with Pole at (π/2,π/2), the mappings of phonon focussing and defocussing are made. It is shown that the mapping for theFTA mode for Nb3Sn exhibits islands acting as impenetrable barriers for phonon propagation.

    • Author Affiliations

       

      A Pushpahasan1 K S Viswanathan1

      1. Department of Physics, University of Kerala, Kariavattom, Trivandrum - 695581, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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