Oxygen-driven competition between low-dimensional structures of Sr 3CoMO6 and Sr3CoMO7-δ with M = Ru, Ir

Daria Mikhailova*, Phillip Reichel, Alexander A. Tsirlin, Artem M. Abakumov, Anatoliy Senyshyn, Kailash M. Mogare, Marcus Schmidt, Chang Yang Kuo, Chin Wen Pao, Tun Wen Pi, Jyh Fu Lee, Zhiwei Hu, Liu Hao Tjeng

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We have realized a reversible structure transformation of one-dimensional 1D K4CdCl6-type Sr3CoMO6 with the Co2+/M4+ cation ordering into the two-dimensional 2D double layered Ruddlesden-Popper structure Sr3CoMO 7-δ with a random distribution of Co and M (with M = Ru, Ir) upon increasing the partial oxygen pressure. The combined soft and hard X-ray absorption spectroscopy studies show that under transformation, Co and M cations were oxidized to Co3+ and M5+. During oxidation, high-spin Co2+ in Sr3CoMO6 first transforms into high-spin Co3+ in oxygen-deficient Sr3CoMO 7-δ, and then further transforms into low-spin Co3+ in fully oxidized Sr3CoMO7 upon further increasing the partial pressure of oxygen. The 1D Sr3CoMO6 compound is magnetically ordered at low temperatures with the magnetic moments lying along the c-axis. Their alignment is parallel for Sr3CoRuO6 and antiparallel for Sr3CoIrO6. The 2D compounds reveal a spin-glass-like behavior related to the random distribution of magnetic cations in the structure.

Original languageEnglish
Pages (from-to)13883-13891
Number of pages9
JournalDalton Transactions
Volume43
Issue number37
DOIs
StatePublished - 2014

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