Effects of pressure and temperature on the vibronic as well as the thermodynamic properties of LiYF₄ and LiYbF₄

Since the tetragonal lithium rare earth fluoroscheelites are excellent laser media with a wide bandgap, studies of their vibronic and thermodynamic properties would help render valuable insights in contriving better technology towards achieving higher lasing efficiency. Hence, in this paper, we try to enunciate a brief account on lattice dynamical calculations of the pressure as well as the temperature dependence of various underlying physical phenomena of two such para-elastic scheelites, namely, LiYF₄ and LiYbF₄. Our computations based on a rigid ion model yield a good deal of parity with the measured Raman data of LiYF₄. These are then comfortably extended for LiYbF₄, to give way to a useful comparative analysis for further studies.