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.
@article{arxiv.0801.4445,
title = {Comparative study of ordered and disordered Y1-xSrxCoO3-d},
author = {S. Fukushima and T. Sato and D. Akahoshi and H. Kuwahara},
journal= {arXiv preprint arXiv:0801.4445},
year = {2008}
}
Comments
3 pages, 3 figures, proceeding of 52nd Mangetism and Magnetic Materials Conference (MMM 2007), published in Journal of Applied Physics