2007
DOI: 10.1063/1.2768895
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Charge order suppression and weak ferromagnetism in La1∕3Sr2∕3FeO3 nanoparticles

Abstract: Perovskite-type polycrystalline La1∕3Sr2∕3FeO3 particles with different sizes (80–2000nm) were prepared using a simple sol-gel technique. In samples of nanoparticles with a diameter of less than 300nm, weak ferromagnetism was observed at room temperature, which was attributed to the lattice distortion. The magnetic and specific heat measurements suggest that the charge ordering state was largely suppressed due to the lowering of the particle size, but the charge ordering temperature remained unaffected.

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Cited by 31 publications
(31 citation statements)
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“…However, even in the simplest oxide, LaFeO 3 , [10,[12][13][14][15] a weak ferromagnetism has been observed linked to either a spin canting or to the Dzyaloshinskii-Moriya (DM) antisymmetrical interactions. Similar behavior was observed in La 1/3 Sr 2/3 FeO 3 perovskites [16]. The magnetic properties of Cu doped perovskites could be very different as a result of the multivalent ions, the change in the magnetic moment due to the charge transfer phenomena between the metal and the oxygen and the change of the exchange interactions rule as a result of the different structural distortions.…”
Section: Introductionsupporting
confidence: 56%
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“…However, even in the simplest oxide, LaFeO 3 , [10,[12][13][14][15] a weak ferromagnetism has been observed linked to either a spin canting or to the Dzyaloshinskii-Moriya (DM) antisymmetrical interactions. Similar behavior was observed in La 1/3 Sr 2/3 FeO 3 perovskites [16]. The magnetic properties of Cu doped perovskites could be very different as a result of the multivalent ions, the change in the magnetic moment due to the charge transfer phenomena between the metal and the oxygen and the change of the exchange interactions rule as a result of the different structural distortions.…”
Section: Introductionsupporting
confidence: 56%
“…At room temperature only the studies of Shen et al [28] about nanostructured LaFeO 3 and of Acharya et al [37] about Al doped LaFeO 3 report open hysteresis loops but with much smaller coercive fields. Gao et al [16] observe coercive fields as large as 0.7 T in La 1/3 Sr 2/3 FeO 3 at 4 K where charge ordering is present, but at room temperature the oxides do not exhibit open loops. In general, considering the group of iron based oxide perovskites, only BiFeO 3 presents ferroelectric hysteresis loops and very weakly magnetism with coercive fields very similar to ours [27].…”
Section: Resultsmentioning
confidence: 97%
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“…Bidrawn et al [23] have investigated the effect of Ca, Sr, and Ba doping on the ionic conductivity and cathode performance of LaFeO 3 and they have found that Sr doped LaFeO 3 exhibits the highest ionic conductivity which opens up new strategies for the development of highly stable, high-performance solid oxide fuel cell (SOFC) cathodes. Gao et al [24] have studied the charge order suppression and weak ferromagnetism in Sr doped LaFeO 3 nanoparticles.…”
Section: Introductionmentioning
confidence: 99%