Interatomic versus intraatomic Ru interactions in perovskites
- Texas Materials Institute, University of Texas at Austin, ETC 9.102, Austin, TX 78712 (United States)
The competition between interatomic Ru-O-Ru interactions responsible for itinerant-electron ferromagnetism in SrRuO{sub 3} and intraatomic spin-orbit coupling that suppresses some Ru-O-Ru magnetic interactions in CaRuO{sub 3} so as to prevent long-range magnetic order has been further tested by investigating the double perovskites La{sub 2}RuZnO{sub 6}, La{sub 2}RuCoO{sub 6}, La{sub 2}TiCoO{sub 6}, and the solid solution Ca{sub 2-2x}La{sub 2x}Ru{sub 2-x}Co{sub x}O{sub 6} (0.0{<=}x{<=}1.0). The paramagnetic state of the low-spin, localized Ru{sup 4+}:t{sup 4}e{sup 0} configuration of LaRuZnO{sub 6} undergoes a progressive transition on lowering the temperature to a non-magnetic state (J=0) as a result of spin-orbit coupling, {lambda}L.S. Comparison of the susceptibilities of La{sub 2}RuCoO{sub 6} and La{sub 2}TiCoO{sub 6} shows a similar behavior with long-range antiferromagnetic cobalt ordering via non-magnetic RuO{sub 6/2} and TiO{sub 6/2} bridges. Comparison is also made of the effect of substituting Ga for Ru in CaRuO{sub 3} with the effect of other dopants M in CaRu{sub 1-x}M{sub x}O{sub 3}. The evolution of transport properties in Ca{sub 2-2x}La{sub 2x}Ru{sub 2-x}Co{sub x}O{sub 6} is also presented. - Graphical abstract: The competition between interatomic Ru-O-Ru interactions responsible for itinerant-electron ferromagnetism in SrRuO{sub 3} and intraatomic spin-orbit coupling that suppresses some Ru-O-Ru magnetic interactions in CaRuO{sub 3} so as to prevent long-range magnetic order has been further tested by investigating the double perovskites La{sub 2}RuZnO{sub 6}, La{sub 2}RuCoO{sub 6}, La{sub 2}TiCoO{sub 6}, and the solid solution Ca{sub 2-2x}La{sub 2x}Ru{sub 2-x}Co{sub x}O{sub 6} (0.0{<=}x{<=}1.0)
- OSTI ID:
- 21212093
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 11; Other Information: DOI: 10.1016/j.jssc.2008.07.023; PII: S0022-4596(08)00391-5; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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