Abstract
We investigated cation-ordered La{sub 1-x}Sr{sub x}MnO{sub 3} about the half-doping level x {approx} 0.5 in superlattices of alternating, single-unit-cell layers of LaMnO{sub 3} and SrMnO{sub 3}. The effect of La/Sr cation order was addressed by comparing the structural, magnetic and transport properties of these superlattices with random-alloy films of equivalent composition. The samples were synthesized by ozone-assisted molecular-beam epitaxy onto SrTiO{sub 3} substrates. The superlattices could be tuned between ferromagnetic and antiferromagnetic metallic states by inserting extra single-unit-cell layers of LaMnO{sub 3} and SrMnO{sub 3}, respectively. For x<0.5, a ferromagnetic, metallic phase was observed. For x=0.50 and 0.55, A-type antiferromagnetic order was confirmed by neutron diffraction, with a Neel temperature of 300 K, significantly higher than bulk values. The enhanced Neel temperature was attributed to lattice strain rather than cation order.
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