Disorder-induced phase coexistence in bulk doped manganites and its suppression in nanometer-sized crystals: The case ofLa0.9Ca0.1MnO3

Specific effects of nanometer scale size on magnetic ordering in La1−xCaxMnO3 (x=0.1, 0.3 and 0.6) manganites

“…1(a) and Table 1, to the temperature T O 0 ÀO Ã $ 500 K of structural transition, which accompanies JTT in stoichiometric Ca0.1 ceramics [13], while T 0 in bulk-Ca0.1 is lower in value and notably smeared (for additional details see Ref. [8]). The DIN À1 (T) dependence for bulk-Ca0.3 fits excellently with CW law, while the same curve for nano-Ca0.3 is essentially nonlinear, see Fig.…”

“…The crystallinity, composition and stoichiometry of the samples studied were tested in the same manner, as described in Ref. [8]. The EMR measurements were performed with Bruker EMX-220 X-band (m = 9.4 GHz) spectrometer in the temperature range of 5 K 6 T 6 600 K using a few milligrams of fine powdered samples, i.e., the as-fabricated nanocrystals and the bulk samples, crushed up to micron-sized powder.…”

Effect of Pr doping on the properties of Bi0.5−xPrxCa0.5MnO3 (0≤x≤0.50) manganites

“…The decrease in grain size enhances surface area and distributes charge inhomogenously leading to phase separation at nano scales [52]. On the other hand, the tunneling of carriers between two Mn ions belonging to different adjacent connecting nanocrystal grains also induces FM-DE correlations [6,16,49,53].…”

“…With increase in Pr content the volume fraction of FM clusters increases, resulting in the enhancement of M value. The high M value for x = 0.50 sample and aweak CO peak may be due to the suppression of chemical inhomogeneities in the sample as compared to the earlier reports[49].…”

Epitaxial La0.9Ca0.1MnO3 films grown on vicinal cut substrates for the investigation of resistivity and thermoelectric anisotropy

“…Among the various doping regimes, the weak doping La 0.9 Ca 0.1 MnO 3 (LCMO) is of peculiar interest as this compound is in the vicinity to several competing order phases within a small compositional range such as ferromagneticÀ metallic (FMM), ferromagneticÀinsulating (FMI) and antiferromagneticÀ insulating (AFI) [1,8,10,11]. At the same time, there is a controversial issue of phase separation (PS) and phase coexistence (PC) in LCMO [12].…”