TY - JOUR
T1 - Differing pressure response of lattice structure in LaTMSb2 (TM = Au or Ag) ternary antimonides
AU - Lingannan, Govindaraj
AU - Joseph, Boby
AU - Kuo, Chia Nung
AU - Lue, Chin Shan
AU - Vajeeston, Ponniah
AU - Sonachalam, Arumugam
N1 - Funding Information:
We thank Xpress beamline of the Elettra Sincrotrone Trieste for beamtime. GL gratefully acknowledges the receipt of a fellowship from the ICTP Programme for Training and Research in Italian Laboratories, Trieste, Italy. BJ acknowledges the availability of DACs through Xpress-PLUS internal project of Elettra Sincrotrone Trieste. PV gratefully acknowledges the Research Council of Norway for providing the computer time (under Projects No. NN2875k and No. NS2875k) at the Norwegian supercomputer facility. AS wishes to thank DST (MES, and SERB), UGC-DAE-CSR (Indore), MHRD-RUSA, TANSCHE (Chennai) and BRNS (Mumbai) for financial support.
Publisher Copyright:
© 2022, Indian Academy of Sciences.
PY - 2022/12
Y1 - 2022/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85139251529&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85139251529&partnerID=8YFLogxK
U2 - 10.1007/s12034-022-02778-2
DO - 10.1007/s12034-022-02778-2
M3 - Article
AN - SCOPUS:85139251529
SN - 0250-4707
VL - 45
JO - Bulletin of Materials Science
JF - Bulletin of Materials Science
IS - 4
M1 - 189
ER -