Electrical properties of Ag–La0.7Ca0.3MnO3

Electrical transport of (1−x)La0.7Ca0.3MnO3+xAl2O3 composites

“…In addition to the shift of the T MI value to the low temperature, the peak resistance of the LCMO/Al 2 O 3 composites also increases with increasing Al 2 O 3 . Similar results were also observed in other systems of manganite-insulator composites [2][3][4][5][6][7][8]. Although these behaviors of the manganite composites have been extensively studied, their physical origins remain unknown.…”

Intrinsic and extrinsic transport properties of Pr0.67Ba0.33MnO3:Ag2O composites

“…While high MR at low magnetic field would help in reducing the bit size on the recording media (thereby increasing the data storage capacity), at the same time the good electrical conductivity will ensure the better connectivity of the device with external circuitry. Recently, several reports indicated that the metal doping/addition or its oxide addition in manganites was helpful in observing improved peak magnetoresistance at low fields with better electrical resistivity [5][6][7][8][9][10][11][12][13][14]. Xiong et al carried out the addition of Pd in La 0.7 Ca 0.2 Sr 0.1 MnO 3 and reported that Pd addition had a little influence on the Curie temperature (T C ) whereas it decreased the electrical resistivity dramatically and shifted the insulator-metal transition temperature (T P ) towards a higher value substantially [5].…”

“…Tang et al investigated the effect of Ag substitution in NdMnO 3 manganite and observed that low field MR was enhanced with increasing silver content [7]. Phong et al [8] and Khiem et al [9] studied the effect of Ag addition on low-field magnetotransport properties of La 2/3 Ca 1/3 MnO 3 (LCMO). They observed that with the increasing Ag content, paramagnetic-ferromagnetic (PM-FM) transition temperature remained almost constant and the insulator-metal transition temperature shifted towards higher temperatures.…”

Comment on ‘Structural properties and electrical resistivity of Na-substituted lanthanum manganites: La1−xNaxMnO3+y (x=0.1, 0.125 and 0.15)’ and ‘Structure and electrical resistivity of La1−xBaxMnO3 (0. 25≤x≤0.35) perovskites’

“…3, 4 in [2]) are described by the model [5]. Note also that it is widely accepted as a suitable tool for analysis of LT conductivity in different polycrystalline manganites [15][16][17][18]. Very impressive results reported in [19,20] brought additional strong arguments in favor of GB originated nature of LT minima on (T) curves of polycrystalline manganites.…”