Abstract
β-Sr 2MnO 4 belongs to the K 2NiF 4-type structure. The magnetic structure studied by neutron diffraction is characterized by antiferromagnetic interactions between nearest-neighbor Mn 4+ ions. The value of the exchange integral J/ k calculated by the high-temperature series expansion method is about −80 K. All magnetic properties of β-Sr 2MnO 4 show the 2D character of the magnetic interactions and illustrate the strong covalency of the Mn-O bonds within the magnetic layers.
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