Hasanli, N;
Scrimshire, A;
Bingham, PA;
Palgrave, RG;
Hayward, MA;
(2020)
Structure and magnetism of the Rh^{4+}-containing perovskite oxides La_{0.5}Sr_{0.5}Mn_{0.5}Rh_{0.5}O_{3} and La_{0.5}Sr_{0.5}Fe_{0.5}Rh_{0.5}O_{3}.
Dalton Transactions
10.1039/d0dt02466j.
(In press).
Preview |
Text
d0dt02466j.pdf - Published Version Download (1MB) | Preview |
Abstract
Synchrotron X-ray powder diffraction data indicate that La_{0.5}Sr_{0.5}Mn_{0.5}Rh_{0.5}O_{3} and La_{0.5}Sr_{0.5}Fe_{0.5}Rh_{0.5}O_{3} adopt distorted perovskite structures (space group Pnma) with A-site and B-site cation disorder. A combination of XPS and {57}^Fe Mössbauer data indicate the transition metal cations in the two phases adopt Mn3+/Rh4+ and Fe3+/Rh4+ oxidation state combinations respectively. Transport data indicate both phases are insulating, with ρ vs. T dependences consistent with 3D variable-range hopping. Magnetisation data reveal that La_{0.5}Sr_{0.5}Mn_{0.5}Rh_{0.5}O_{3} adopts a ferromagnetic state below T_{c} ~ 60 K, which is rationalized on the basis of coupling via a dynamic Jahn–Teller distortion mechanism. In contrast, magnetic data reveal La_{0.5}Sr_{0.5}Fe_{0.5}Rh_{0.5}O_{3} undergoes a transition to a spin-glass state at T ∼ 45 K, attributed to frustration between nearest-neighbour Fe–Rh and next-nearest-neighbour Fe–Fe couplings
| Type: | Article |
|---|---|
| Title: | Structure and magnetism of the Rh^{4+}-containing perovskite oxides La_{0.5}Sr_{0.5}Mn_{0.5}Rh_{0.5}O_{3} and La_{0.5}Sr_{0.5}Fe_{0.5}Rh_{0.5}O_{3} |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d0dt02466j |
| Publisher version: | https://doi.org/10.1039/D0DT02466J |
| Language: | English |
| Additional information: | © The Royal Society of Chemistry 2020. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence (http://creativecommons.org/licenses/by-nc/3.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10107898 |
Archive Staff Only
 |
View Item |
