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The influence of the A-site ionic radii (<rA>) on the magnetic structure hasbeen investigated in La0.5Ca0.5-xSrxMnO3 compounds (0 .GE. x .LE. 0.5) usingneutron diffraction, magnetization, and resistivity techniques. All compoundsin the composition range x .LE. 0.3 crystallize in the orthorhombic structure(Space Group Pnma). No further structural transition is observed as temperatureis lowered below 300K. The compound x = 0.4, is a mixture of two orthorhombicphases crystallizing in Pnma and Fmmm space group. The x = 0.5 compound has atetragonal structure in the space group, I4/mcm. The charge ordered (CO) statewith CE-type antiferromagnetic order remains stable for x .LE. 0.3. Above x =0.3, the CE-type antiferromagnetic state is suppressed. In x = 0.4 compound,A-type antiferromagnetic ordering is found at temperatures below 200K. Orbitalordering accompanying the spin ordering is found in all the samples with x .LE.0.4. The system becomes ferromagnetic at x = 0.5 and no signature of orbitalordering is observed. As a function of <rA>, the charge ordered state is stableup to <rA> ~ 1.24A, and is suppressed thereafter. The magnetic structureundergoes a transformation from CE-type antiferromagnetic state to aferromagnetic state with an intermediate A-type antiferromagnetic state.

The Influence of A-site Ionic Radii on the Magnetic Structure of Charge Ordered La0.5Ca0.5-xSrxMnO3 Manganites