Magnetic and thermodynamic properties of Sr2LaFe3O9

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Abstract
Measurements of the magnetization, specific heat, and 57Fe Mössbauer spectrum are presented for Sr2LaFe3O9. The temperature dependence of the specific heat and magnetization indicates that Sr2LaFe3O9 undergoes an antiferromagnetic transition at TN=203 K. The small entropy removal ΔS and small effective paramagnetic moment μeff suggest an itinerant character for the Fe moment in this compound. In low applied fields, the zero field cooled (ZFC) and field cooled (FC) magnetization below TN exhibit a hysteretic behavior indicating the existence of some ferromagnetic correlation. This behavior is suppressed by high applied fields. The 57Fe Mössbauer spectrum measured at 4.2 K for Sr2LaFe3O9 indicates two superimposed hyperfine fields of 260 and 450 kOe with area ratios of 1/3 and 2/3, respectively, consistent with previous measurements.