High Temperature LFMR in Yttrium Doped Perovskite Manganites
来源期刊：JOURNAL OF RARE EARTHS2003年第5期
论文作者：储成林 林萍华 盛晓波 翟亚 杨石强 童林夙
Key words：metal materials; colossal magnetoresistance; low-field magnetoresistance; perovskite manganites; ceramics; rare earths;
Abstract: Porous ceramic samples of Y doped perovskite manganites were prepared. In these samples, the transition from high temperature paramagnetic insulator to low temperature ferromagnetic metal as well as the low field magnetoresistance (LFMR) effect at the low temperature is similar to that in dense samples. Opposite to that in dense samples, LFMR effect in porous sample is observed at the high temperature close to the peak of MR-T curves. The results suggest that the high temperature LFMR effect and the applicable colossal magnetoresistance (CMR) materials could be obtained by controlling the microstructures of this class of perovskite manganites.
储成林1，林萍华1，盛晓波2，翟亚3，杨石强1，童林夙2
(1.Department of Mechanical Engineering, Southeast University, Nanjing 210096, China;
2.Department of Electronic Engineering, Southeast University, Nanjing 210096, China;
3.Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China)
Abstract:Porous ceramic samples of Y doped perovskite manganites were prepared. In these samples, the transition from high temperature paramagnetic insulator to low temperature ferromagnetic metal as well as the low field magnetoresistance (LFMR) effect at the low temperature is similar to that in dense samples. Opposite to that in dense samples, LFMR effect in porous sample is observed at the high temperature close to the peak of MR-T curves. The results suggest that the high temperature LFMR effect and the applicable colossal magnetoresistance (CMR) materials could be obtained by controlling the microstructures of this class of perovskite manganites.
Key words:metal materials; colossal magnetoresistance; low-field magnetoresistance; perovskite manganites; ceramics; rare earths;
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