Structure and magnetic properties of the orthorhombic n=2 Ruddlesden-Popper phases Sr3Co2O5+δ (δ=0.91, 0.64 and 0.38)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Structure and magnetic properties of the orthorhombic n=2 Ruddlesden-Popper phases Sr₃Co₂O₅₊_δ (δ=0.91, 0.64 and 0.38)

Authors:	L. Viciu H.W. Zandbergen Q. Huang R.J. Cava

Affiliation:	^a Department of Chemistry, Princeton University, Princeton, NJ 08540, USA ^b Department of Nanoscience, Delft Institute of Technology, National Centre for HREM, Al Delft, The Netherlands ^c NIST Center for Neutron Research, NIST, Gaithersburg, MD 20899, USA ^d Department of Physics, Princeton University, Princeton, NJ 08540, USA

Abstract:	The reduced Ruddlesden-Popper phases, Sr₃Co₂O₅₊_δ with δ=0.91, 0.64 and 0.38, have been prepared in a nitrogen atmosphere. The crystal structures were determined by powder neutron diffraction. Oxygen vacancies are found both in O(3) and O(4) sites but the majority are along one crystallographic axis in the CoO₂ plane, inducing an orthorhombic distortion of the normally tetragonal n=2 Ruddelsden-Popper structure. Superstructures due to oxygen ordering are observed by electron microscopy. The magnetic measurements reveal complex behavior with some ferromagnetic interactions present for Sr₃Co₂O_5.91 and Sr₃Co₂O_5.64.

Keywords:	Sr₃Co₂O₅₊_δ Oxygen deficient Ruddlesden-Popper phase Magnetic properties
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