Magnetic excitations in square lattice 2D Heisenberg Antiferromagnet Sr3Fe2O6.5

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Strontium iron oxides belonging to the RP series Srn+1FenO3n+1 (n = 1, 2, ..,1) may offer unique insights into the differences between the magnetic properties of the manganates,ruthenates, and ferrates. The present proposal on Sr3Fe2O6.5 is motivated by our recent observations that there is a change in crystal structure from tetragonal (for Sr3Fe2O7) to orthorhombic ( for Sr3Fe2O6.5), where the 4-fold symmetry is lost. A preliminary refinement suggests that in the magnetic structure moments lie...
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