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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.56: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

Superexchange Interactions in Double Perovskite Osmates — •Ryan Morrow^1,2, Rohan Mishra¹, Oscar D. Restrepo¹, Molly R. Ball¹, Wolfgang Windl¹, Jennifer R. Soliz¹, Adam J. Hauser¹, James C. Gallagher¹, Michael A. Susner^1,4, Michael D. Sumption¹, Fengyuan Yang¹, Sabine Wurmehl^2,3, Ulrike Stockert^2,3, Bernd Büchner^2,3, Adam A. Aczel⁴, Jiaqiang Yan⁴, Michael A. McGuire⁴, John W. Freeland⁵, Daniel Haskel⁵, and Patrick M. Woodward¹ — ¹OSU, Columbus, OH, United States — ²IFW, Dresden, Germany — ³TUD, Dresden, Germany — ⁴ORNL, Oak Ridge, TN, United States — ⁵ANL, Argonne, IL, United States

Double perovskites containing rock salt ordered 3d and 4d/5d cations have been intensely studied for their wide range of technologically relevant properties. Design of functional materials in the insulating state, where magnetic properties are dictated by superexchange interactions, remains challenging however due to the poorly understood competition between numerous potential exchange pathways. In this work, a number of insulating double perovskite osmates, A2BOsO6 (A=Sr,Ca,La; B=Cr,Fe,Co,Ni) have been chosen and studied using magnetometry, specific heat, XMCD, and neutron powder diffraction techniques in order to systematically probe the effects of electronic configuration and bonding geometry on the magnetic ground state. It is concluded that the magnetic ground state is controlled by a tunable competition between short range and long range superexchange interactions which are sensitive to electronic configuration and bonding geometry.