Low-field magnetoresistance of (1−x)La0.7Ca0.3MnO3+xAg composites

Low-field magnetoresistance of La0.7Ca0.3MnO3 perovskite synthesized by reactive milling method

“…In order to explain the magnetic field dependence of magnetoresistance in granular LCMO we used a phenomenological model which takes into account the spin-polarized tunneling at the grain boundaries [14,17]. The intrinsic contribution to the magnetoresistance is separated from the contribution coming from intergranular spin-polarized transport with paying attention to the domain wall motion across the grain boundaries in an applied magnetic field.…”

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

“…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]. And the substitutions of other metal ions for Mn have also been studied [16][17][18]. Then, what about the infrared emissivity of B site doped manganites?…”

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.…”