Infuence of the A-cation size on the paramagnetic susceptibility in A2CoWO6 (A = Ca, Sr and Ba)

R.D. SÁNCHEZ; C.A. LÓPEZ; M.E. SALETA; J. CURIALE

Buenos Aires

Workshop; X Latin American Workshop on Magnetism, Magnetic Materials and their Applications; 2013

Antiferromagnetic A2CoBO6 double perovskites are interestingoxides to produce more complex systems as spin valves and othersthat use exchange bias mechanism. The antiferromagneticA2CoWO6 (with A = Ca, Sr or Ba) family called our attention due totheir crystalline structure versatility: Ca2CoWO6 (monoclinic),Sr2CoWO6 (tetragonal) and Ba2CoWO6 (cubic).The crystalline structures affect mainly the Co-O distances and thelocal octahedral symmetry of the CoO6. We found that the effectivemagnetic moment (meff) of Co2+ is partially unquenched and wealso found that meff increases with the average of Co-O distances. Inthis contribution we describe a simple model that explain theexperimental behavior of the effective magnetic moment and itsrelation with the crystal field. More details in our work Ref. [1].[1] C.A. López, M.E. Saleta, J.Curiale and R.D. Sánchez, Mat. Res. Bull. 47, 1158–1163 (2012).