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

Critical behavior and spontaneous magnetization estimation in La0.5Sr0.5MnO3 compound

“…Moreover, a clear small cusp-like behavior occurs just below the ferromagnetic transition temperature which can be explained by the coexistence of a minor tetragonal phase with oxygen deficiency. Similar results were reported in lacunar La 0.5 Sr 0.5 MnO 2.88 sample where a ferromagnetic state is shown below 314K and antiferromagnetic one at 205K[25]. Such phenomenon affects the magnetic behavior in comparison to the parent compound La 0.5 Sr 0.5 MnO 3 .…”

The effect of B site doping on infrared emissivity of lanthanum manganites La0.8Sr0.2Mn1−B O3 (B = Ti or Cu)

“…The magnetic properties and low-field magnetoresistance of La 0.7 Sr 0.3 Mn 0.9 Cu 0.1 O 3 compounds have been studied by Zhao et al, and the Mn-site substitution by various M could not enhance the MR response at a low magnetic field of 2 kOe [13]. Kallel et al have reported that the substitution of 50% Mn with Ti changes the structure of La 0.5 Sr 0.5 Mn 0.5 Ti 0.5 O 3 compound from the tetragonal to rhombohedral symmetry and cuts-off the longrange ordering of Mn 3+ /Mn 4+ , hence, the localization of e g electrons is suppressed and the CO is drastically destroyed by the doping [14]. Castellano et al have reported that the Cu substitution weakens in a relevant and outstanding way the FM long-range phase in the (La 1−x Ca x )(Mn 1−y Cu y )O 3 compound with x < 0.50 while the CO phase in the second class of samples (x > 0.50) results to be only slightly conditioned [15].…”

Competing two-phase coexistence in doped manganites: Direct observations byin situLorentz electron microscopy

“…3͒ using the approach in Ref. 28. Such estimates are not very accurate in the absence of real magnetic saturation requiring higher magnetic fields.…”