Synthesis and colossal magnetoresistance effect of layered perovskites Sm2-2xSr1+2xMn2O7 (x=0.2, 0.4, 0.5)

Liu  JW; Chen  G; Li  ZHLue  ZZhang  ZG

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Synthesis and colossal magnetoresistance effect of layered perovskites Sm2-2xSr1+2xMn2O7 (x=0.2, 0.4, 0.5)

机译：Synthesis and colossal magnetoresistance effect of layered perovskites Sm2-2xSr1+2xMn2O7 (x=0.2, 0.4, 0.5)

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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 rho(0) - p(H)/rho(0) x 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, 5T) for x = 0.4 to 33.44 (105 K, 5T) for x = 0.5. Moreover, the Curie temperature (T-c) decreases with increasing x. (c) 2007 Elsevier B.V. All rights reserved.

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《Materials Chemistry and Physics》 |2007年第3期|185-188|共4页
作者
Liu JW; Chen G; Li ZHLue ZZhang ZG;
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作者单位

Harbin Inst Technol, Sch Sci, Dept Appl Chem, Harbin 150001, Peoples R China;

Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China;

Harbin Normal Univ, Dept Chem, Harbin 150025, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
ruddlesden-popper phase; magnetoresistance; magnetic; GIANT MAGNETORESISTANCE; DOUBLE EXCHANGE; MANGANATES;

Synthesis and colossal magnetoresistance effect of layered perovskites Sm2-2xSr1+2xMn2O7 (x=0.2, 0.4, 0.5)

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