Magnetic and thermodynamic properties of Sr2LaFe3O9

Abstract

Articles you may be interested inThe manipulation of magnetic properties by resistive switching effect in CeO2/La0.7(Sr0.1Ca0.9)0.3MnO3 system J. Appl. Phys. 113, 17C708 (2013); 10.1063/1.4795214Effect of (Bi, La)(Fe, Zn)O3 thickness on the microstructure and multiferroic properties of BiFeO3 thin films Measurements of the magnetization, specific heat, and 57 Fe Mössbauer spectrum are presented for Sr 2 LaFe 3 O 9 . The temperature dependence of the specific heat and magnetization indicates that Sr 2 LaFe 3 O 9 undergoes an antiferromagnetic transition at T N ϭ203 K. The small entropy removal ⌬S and small effective paramagnetic moment eff suggest an itinerant character for the Fe moment in this compound. In low applied fields, the zero field cooled ͑ZFC͒ and field cooled ͑FC͒ magnetization below T N exhibit a hysteretic behavior indicating the existence of some ferromagnetic correlation. This behavior is suppressed by high applied fields. The 57 Fe Mössbauer spectrum measured at 4.2 K for Sr 2 LaFe 3 O 9 indicates two superimposed hyperfine fields of 260 and 450 kOe with area ratios of 1/3 and 2/3, respectively, consistent with previous measurements.

Magnetic and thermodynamic properties of Sr2LaFe3O9

“…This behavior is also reflected in the magnetic susceptibility, which exhibits a sharp jump at the transition, in agreement with the susceptibility measured by Wang et al [4] and also with the one reported by Zhou et al [3], see figure 3. We see that the susceptibility curve obtained within the mean-field theory fits both qualitatively and quantitatively to the one measured by Wang et al [4], however the authors of ref. [3] obtain a larger jump at the critical temperature.…”

“…On the other hand, the compound with the closest composition to the latter was studied experimentally by Wang et al in [4]. Therefore, we believe that our theory is more suitable for fitting the experimental data of ref.…”

“…Therefore, we believe that our theory is more suitable for fitting the experimental data of ref. [4] than those of [2] or [3], especially from the quantitative point of view. However, we also obtain good qualitative agreement with the authors of refs.…”

“…A reasonable (numerical) fit to the experimental data [4] on the magnetic susceptibility and specific heat given in figures 3 and 4, led to the following values of the exchange integrals and biquadratic interactions…”

Structural and magnetic properties of RSr2Fe3O9 (R=La, Y, Pr, and Gd)

“…8,9 RBFO compounds are more or less widely explored until now. [3][4][5][6][7][8][9] On the other hand for RSr 2 Fe 3 O 9 ͑RSFO͒, while the structural details are available for most of R members, 10 detailed magnetic measurements were reported recently only for LaSr 2 Fe 3 O 9 ͑LSFO͒.…”