Colossal magnetoresistance in cluster glass-like insulator La0.67Sr0.33(Mn0.8Ni0.2)O-3
Publication in refereed journal

香港中文大學研究人員

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替代計量分析
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其它資訊
摘要Substitution of Ni for Mn in La0.67Sr0.33MnO3 (LSMO) lowers the Curie temperature T-C from 365 K for LSMO to 194 K for La0.67Sr0.33(Mn-0.8 Ni-0.2)O-3, which exhibits a cluster glass-like state. The oxide is insulating under both zero field and 60 kOe, but application of the magnetic field induces colossal magnetoresistance (CMR) especially at low temperature. Far below T-C, the compound's field dependence of resistivity has a very similar shape with that of metallic perovskite manganite at relatively high temperature when the spin fluctuation grows stronger. The results indicate that the ferromagnetic superexchange between Ni and Mn, is helpful for the overall ferromagnetic exchange components just overcoming the generic antiferromagnetic exchange components, which leads to the presence of the cluster glass-like state. The reduction of the magnetic disorder and the suppression of the spin fluctuation in Mn-O layer by the external magnetic field are suggested to explain the CMR effect in this insulating compound (C) 1999 American Institute of Physics. [S0021-8979(99)36008-4].
著者Wang ZH, Shen BG, Tang N, Cai JW, Ji TH, Zhao JG, Zhan WS, Che GC, Dai SY, Ng DHL
會議名稱43rd Annual Conference on Magnetism and Magnetic Materials
會議開始日09.11.1998
會議完結日12.11.1998
會議地點MIAMI
期刊名稱Journal of Applied Physics
出版年份1999
月份4
日期15
卷號85
期次8
出版社AMER INST PHYSICS
頁次5399 - 5401
國際標準期刊號0021-8979
電子國際標準期刊號1089-7550
語言英式英語
Web of Science 學科類別Physics; Physics, Applied; PHYSICS, APPLIED

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