Ferromagnetic–antiferromagnetic transition in tetragonal La0.50Sr0.50MnO3

Research on charge-ordering state in La0.5Sr0.5MnO2.88 and La0.5Sr0.5Mn0.5Ti0.5O3 systems

“…The value of goodness of fit w 2 is low, indicating that the refined crystal-structure model is in good agreement with the observed data. We may note that the same tetragonal structure (I4/mcm) was reported recently for a similar compound with nearly identical lattice parameters but shifted oxygen stoichiometry La 0.5 Sr 0.5 MnO 3 [16]. In fact, previous studies show that pure phase La 0.5 Sr 0.5 MnO 3 is ferromagnetic and metallic at room temperature with a T C well above room temperature (350 K) [17,18].…”

From A-type antiferromagnetism to ferromagnetism in half-doped perovskite manganites

“…As a result, the ferromagnetic temperature is markedly increased and reaches T C ¼ 305 K for La 0.5 Sr 0.4 Ba 0.1 MnO 3 . The Curie temperature thus approaches the value observed for La 0.5 Sr 0.5 MnO 3 (/r A S ¼ 1:263 ( A, s 2 ¼ 0:0022 ( A 2 ), in its tetragonal I4/mcm form, T C ¼ 310 K [11]. As to the low-temperature AF transition in the present samples, the N!…”

“…In order to shed light on the effect of the A-site cationic size mismatch in manganites with large /r A S values, four compounds have been studied. Their formulas were chosen in order to obtain /r A S values in the region of the frontier between A-type AF and F. These /r A S values surround the /r A S value of La 0.5 Sr 0.5 MnO 3 , (1.263 ( A), reported to be either F [10] or AF at low temperature [11]; the corresponding samples are Pr 0. 3 .…”

High pressure effects on the crystal and magnetic structure of nanostructured manganites La0.63Sr0.37MnO3 and La0.72Sr0.28MnO3

“…However, rather surprisingly, the magnetic ground state is defined by a coexistence of FM and A-type AFM phases [22]. The occurrence of the AFM phase, known for the "half-doped" bulk compound La 0.5 Sr 0.5 MnO 3 [23], was attributed to oxygen excess in the nanoparticles in a way to chemical composition as La 1-x Sr x MnO 3+δ . But, in the same time, the reduction of a magnetic moment of the FM phase of such nanostructure manganites was described by weakening of the double-exchange mechanism, where Mn-O bond lengths and valence angles Mn-O-Mn slightly changed by inner strains on the nanoparticle surface [22].…”

“…Recently it was proposed that in the nanostructured manganites synthesized by MSS method, the over-oxidation effects on a nanoparticle surface provokes a chemical composition shifting in a way to "half-doped" manganite La 0.5 Sr 0.5 MnO 3 [23], the magnetic structure of this manganite are A-type AFM [30]. As an indirect confirmation of oxygen non-stoichiometry model was an additional annealing, which leads to an increase of the spontaneous FM moment and a slight drop of AFM one [22].…”