Enhancement of magnetoresistance in Mn substituted La2/3Sr1/3 Mn1−Zr O3 granular system

Phase Formation in the System ZrO2–LaO1.5–MnOx in Air and P∼1 Pa After 500 h of Annealing at 1200° and 1400°C

“…2(a), although the determined values are compatible with the literature. The solubility limit of Zr on the B site of La 2/3 Sr 1/3 MnO 3 has been reported to be <5 at.% 18 . An investigation of La 1− x Zr x MnO 3 compounds indicates that the solubility of Zr on the A site of LaMnO 3 is also below 5 at.%, 19 as Mn 2 O 3 was found as a secondary phase even for the composition with x =0.05.…”

Colossal Magnetoresistance of A-Site Ordered (NdBaSm)2Mn2O6 at Ambient Temperature

“…Thus, at lower fields too, the CMR obtained is an order of magnitude higher than the value obtained earlier. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] T CO increases with y initially, for both x ¼ 0:1 and 0.2. The effect of further increase in y is anomalous.…”

“…Several attempts have been made to obtain larger CMR at room temperature. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] The A-site ordered RBaMn 2 O 6 have also been investigated earlier for this purpose. 41,42) The difference in the sizes of RO and BaO planes distorts the MnO 6 octahedron in the A-site ordered manganites, resulting in high T CO when R = Sm 3þ or a smaller ion.…”

“…[1][2][3][4][5][6] Several studies have been made to obtain large magnetoresistance (MR) at room temperature. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] In this context, two recent developments appear promising. Firstly, it has been found 27,28) that the colossal MR (CMR) of a composition is maximum when it is close to the phase boundary between ferromagnetic (FM) metal and spin glass (SG) or noncollinear (NC) insulator.…”