Structural and Magneto-Transport Properties of Copper Doped Double Layered Manganites La1.4Ca1.6Mn2O7

Mahamdioua, N.; Amira, A.; Altintas, S.P.; Saoudel, A.; Boudjadja, Y.; Amirouche, Lynda; Varılcı, A.; Terzioğlu, C.

doi:10.1007/s10948-012-2024-0

Cited by 5 publications

(1 citation statement)

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“…The change of MR sign is due to many factors like spin disorder, intergrain spin-polarized tunneling [33], nearly fully spinpolarized carriers tunneling through the insulating ZrO grains [31][32][33][34]. As a result, a positive MR appears [35,36]. We point out that the best sample is Zr x= 0.10 , where MR reaches to 27 % at 123 K Table 3.…”

Section: Resultsmentioning

confidence: 89%

Enhanced electro-magnetic properties in La0.7Sr0.3MnO3/ZrO2 composites

et al. 2014

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La 0.7 Sr 0.3 MnO 3 ) 1-x /(ZrO 2 ) x (x = 0.0-0.150, step 0.025) composites have been prepared via solid state reaction process. The X-ray diffraction and scanning electron microscopic observations indicate that there are ZrO 2 grains separated from La 0.7 Sr 0.3 MnO 3 matrix. It has been found that the inclusion of ZrO 2 content decreases the conductivity, magnetization and metal-semiconductor transition, whereas it increases the low field magnetoresistance. Possible effects of grain boundaries on the low field magnetoresistance have been discussed. The small ZrO 2 grains are trapped between La 0.7 Sr 0.3 MnO 3 grains may be acting as a barrier for spin-polarized tunneling and enhance the low-field magnetoresistance.

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