Suppression of Lattice Doubling in Quasi-Skutterudite La 3 Rh 4 Sn 13 : A Comparison of Temperature and Hydrostatic Pressure Routes.

Autor: Sundaramoorthy M; Elettra - Sincrotrone Trieste S.C. p. A., S.S. 14, Km 163.5 in Area Science Park, 34149, Basovizza, Italy.; Centre for High Pressure Research, School of Physics, Bharathidasan University, 620024, Tiruchirappalli, India., Lingannan G; Centre for High Pressure Research, School of Physics, Bharathidasan University, 620024, Tiruchirappalli, India., Kumar Mondal P; Elettra - Sincrotrone Trieste S.C. p. A., S.S. 14, Km 163.5 in Area Science Park, 34149, Basovizza, Italy., Lue CS; Department of Physics, National Cheng Kung University, 70101, Tainan, Taiwan.; Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, 10601, Taipei, Taiwan., Kuo CN; Department of Physics, National Cheng Kung University, 70101, Tainan, Taiwan.; Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, 10601, Taipei, Taiwan., Arumugam S; Centre for High Pressure Research, School of Physics, Bharathidasan University, 620024, Tiruchirappalli, India.; Tamil Nadu Open University, 600015, Chennai, India., Joseph B; Elettra - Sincrotrone Trieste S.C. p. A., S.S. 14, Km 163.5 in Area Science Park, 34149, Basovizza, Italy.
Jazyk: angličtina
Zdroj: Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2024 Oct 16; Vol. 25 (20), pp. e202400286. Date of Electronic Publication: 2024 Aug 05.
DOI: 10.1002/cphc.202400286
Abstrakt: We present structural properties at different temperatures and high-pressure (HP) of La 3 Rh 4 Sn 13 which is one of the interesting systems in the Remika phase RE 3 Rh 4 Sn 13 (RE=Sr, Ca, La, Pr, Ce) quasi-skutterudite series using synchrotron diffraction. Data at ambient conditions revealed the presence of several weak reflections, which could be accounted only with a superlattice I* structure (I4 1 32) with lattice parameter a~19.457 Å. However, above 350 K, a complete suppression of the weak superlattice reflections of the I* structure is observed. Data at higher temperatures is found to be well described by the I structure (Pm-3n) having half the lattice parameter compared to the I* structure. HP-XRPD at ambient temperature showed that pressures greater than 7.5 GPa result in similar suppression of the weak I* superlattice reflections. Data at higher pressures is found to be well described by the I structure (Pm-3n), similar to the high-temperature phase. HP Raman measurements demonstrated changes that seem to be consistent with a locally more ordered structure as in the case of the I*→I transition. Our findings on La 3 Rh 4 Sn 13 open up new avenues to study unexplored HP phenomena, especially the superconductivity in these Remika phase quasi-skutterudites.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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