Negative Linear Compressibility and Auxeticity in Boron Arsenate

  title={Negative Linear Compressibility and Auxeticity in Boron Arsenate},
  author={James N. Grima-Cornish and Liana Vella-Żarb and Joseph N. Grima},
  journal={Annalen der Physik},
A novel mechanism is identified leading to negative linear compressibility (NLC) in boron arsenate which is shown to arise from deformations in the framework tetrahedra rather than more conspicuous tetrahedral rotations. Instead, such rotations, which manifest as “rotating squares” when viewed down the c direction, are found to result in negative Poisson's ratio (NPR) in the (001) plane, which in turn augments the compressibility, a phenomenon that should be applicable to other auxetic… 

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