Formation of collapsed tetragonal phase in EuCo₂As₂ under high pressure.

  title={Formation of collapsed tetragonal phase in EuCo₂As₂ under high pressure.},
  author={Matthew Bishop and Walter O Uhoya and Georgiy M Tsoi and Yogesh K. Vohra and A S Sefat and Brian C Sales},
  journal={Journal of physics. Condensed matter : an Institute of Physics journal},
  volume={22 42},
The structural properties of EuCo₂As₂ have been studied up to 35 GPa, through the use of x-ray diffraction in a diamond anvil cell at a synchrotron source. At ambient conditions, EuCo₂As₂ ) (I4/mmm) has a tetragonal lattice structure with a bulk modulus of 48 ± 4 GPa. With the application of pressure, the a axis exhibits negative compressibility with a concurrent sharp decrease in c-axis length. The anomalous compressibility of the a axis continues until 4.7 GPa, at which point the structure… CONTINUE READING