Differing pressure response of lattice structure in LaTMSb2 (TM = Au or Ag) ternary antimonides

Govindaraj Lingannan, Boby Joseph, Chia Nung Kuo, Chin Shan Lue, Ponniah Vajeeston, Arumugam Sonachalam

研究成果: Article同行評審


Ternary antimonides LaTMSb2 (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 LaAgSb2 transformed from tetragonal to a mixed tetragonal (>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 LaAuSb2 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.

期刊Bulletin of Materials Science
出版狀態Published - 2022 12月

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 材料力學


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