Comparative study of ordered and disordered Y1-xSrxCoO3-d
S. Fukushima, T. Sato, D. Akahoshi, H. Kuwahara
TL;DR
This study compares the structural and magnetic properties of ordered and disordered Y1-xSrxCoO3-d, revealing how A-site disorder influences oxygen vacancy ordering and electronic phases, with implications for magnetic and metallic transitions.
Contribution
It provides a comparative analysis of ordered and disordered Y1-xSrxCoO3-d, highlighting the effects of A-site disorder on oxygen vacancy orderings and electronic phase transitions.
Findings
Ordered structure shows oxygen vacancy order and high-temperature ferromagnetism.
Disordered structure lacks vacancy order and exhibits ferromagnetic metallic transition at lower temperature.
Disordering disrupts oxygen-vacancy and orbital orderings, altering electronic phases.
Abstract
We have succeeded in preparing A-site ordered- and disordered-Y1/4Sr3/4CoO3-d with various oxygen deficiencies delta, and have made comparative study of their structural and physical properties. In the A-site ordered structure, oxygen vacancies order, and d = 0.34 sample shows a weak ferromagnetic transition beyond 300 K. On the other hand, in the A-site disordered structure, no oxygen vacancy ordering is observed, and d = 0.16 sample shows a ferromagnetic metallic transition around 150 K. A-site disordering destroys the orderings of oxygen-vacancies and orbitals, leading to the strong modification of the electronic phases.
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