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Volume 45 All articles Published: 27 September 2022 Article ID 0189
Differing pressure response of lattice structure in LaTMSb$_2$ (TM = Au or Ag) ternary antimonides
GOVINDARAJ LINGANNAN BOBY JOSEPH CHIA NUNG KUO CHIN SHAN LUE PONNIAH VAJEESTON ARUMUGAM SONACHALAM
Ternary antimonides LaTMSb$_2$ (TM = Au or Ag) share identical lattice symmetry and exhibit the charge density wave (CDW) phenomenon. The CDW is found to be tunable either by physical or chemical pressure, triggering the investigation of the pressure response of these systems. Here, we compare the lattice structure response of the two systems to the hydrostatic pressure. Under hydrostatic pressure, the lattice structure of LaAgSb$_2$ transformed from tetragonal to a mixed tetragonal (${\ge}$4 GPa) followed by monoclinic (4–9 GPa) and then to a mixed monoclinic and orthorhombic (9–41.8 GPa) phases. In contrast, our synchrotron X-ray diffraction results on LaAuSb$_2$ reveal that the tetragonal structure is stable in the pressure range of 0–12.2 GPa. Our experimental investigation is well supported by the density functional theory (DFT) calculations. We have used DFT to identify the experimental Raman vibrational modes at ambient conditions. We highlight the importance of structural subtleties in the differing pressure response of the ternary antimonides.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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