Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1527587 | Materials Chemistry and Physics | 2007 | 4 Pages |
Abstract
Polycrystalline layered perovskite manganites Sm2−2xSr1+2xMn2O7 (x = 0.2, 0.4, 0.5) were synthesized by the citrate-gel method. Their magnetic and electric properties were investigated. The samples with x = 0.4 and 0.5 show insulating behavior. However, a metal–insulator (M–I) transition is observed for x = 0.2. The maximum value of MR [ρ(0) − ρ(H)]/ρ(0) × 100%] for x = 0.2 is 89.88% (105 K, 5 T) and 66.36% (105 K, 2 T). The MR is efficiently decreased from 57.62% (105 K, 5 T) for x = 0.4 to 33.44% (105 K, 5 T) for x = 0.5. Moreover, the Curie temperature (Tc) decreases with increasing x.
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Authors
J.W. Liu, G. Chen, Z.H. Li, Z. Lü, Z.G. Zhang,