The effect of doping additional Bi on the magnetoresistance (MR) of La2/3Ca1/3BxMn1-x O3 was investigated. It is found that traditional colossal magnetoresistance (CMR) peak can only be observed in the x＜0.05 samples and the peak value decreases with the increase of x, but the x≥0.05 samples show a magnetoresistance plateau above 200 K because of the presence of additional (La,Ca,Bi)-O layers. Moreover, this MR plateau is enhanced for the segregation of the La,Ca, and Bi elements.
参考文献
| [1] | Li XW;Gupta A;Xiao G;Gong GQ .Low-field magnetoresistive properties of polycrystalline and epitaxial perovskite manganite films[J].Applied physics letters,1997(8):1124-1126. |
| [2] | D. K. Petrov;L. Krusin-Elbaum;J. Z. Sun .Enhanced magnetoresistance in sintered granular manganite/insulator systems[J].Applied physics letters,1999(7):995-997. |
| [3] | Xia ZC.;Yuan SL.;Feng W.;Zhang LJ.;Zhang GH.;Tang J.;Liu L.;Liu DW. Zheng QH.;Chen L.;Fang ZH.;Liu S.;Tang CQ. .Magnetoresistance and transport properties of different impurity doped La0.67Ca0.33MnO3 composite[J].Solid State Communications,2003(8):567-572. |
| [4] | Zhou QX;Dai MX;Wang RH;Liu CZ;Zhang GQ;Ai DF;Feng JW .Enhancement of magneto resistance in Mn substituted La2/3Sr1/3Mn1-xZrxO3 granular system[J].Physica, B. Condensed Matter,2006(1):120-125. |
| [5] | Zhao LF;Chen W;Shang JL;Chen L;Liu S;Xia ZC;Yuan SL .Giant magnetoresistance on low field in non-stoichiometric La2/3Ca1/3Mn1-xO3[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,2005(14):2480-2483. |
| [6] | Walsh MC.;Giguere A.;Bahadur D.;Mandal SK.;Dunlap RA.;Foldeaki M. .Magnetic and electronic properties of the magnetoresistive perovskites La0.67-xBixCa0.33MnO3[J].Physica, B. Condensed Matter,1998(1/2):103-110. |
| [7] | Xia ZC;Liu DW;Chen L;Fang CH;Dong B;Liu G;Liu L;Liu S;Tang CQ;Yuan SL .Engineering of heterogeneous oxide for grain boundaries and transport properties of La0.67Ca0.33MnO3[J].Journal of Magnetism and Magnetic Materials,2004(2/3):251-257. |
| [8] | Wang XL.;Lang W.;Horvat J.;Liu HK.;Dou SX.;Gehringer P. .Effect of grain connectivity and density on the magnetoresistance in Ca or Li doped lanthanum manganites[J].Solid State Communications,2000(1):53-56. |
| [9] | Wang XL.;Liu HK.;Ionescu M.;Zeimetz B.;Dou SX. .Large low-field magnetoresistance over a wide temperature range induced by weak-link grain boundaries in La0.7Ca0.3MnO3[J].Applied physics letters,1998(3):396-398. |
| [10] | de Andres A.;Martinez JL.;Garcia-Hernandez M. .Conduction channels and magnetoresistance in polycrystalline manganites[J].Physical Review.B.Condensed Matter,1999(10):7328-7334. |
| [11] | Asano H.;Matsui M.;Hayakawa J. .TWO-DIMENSIONAL FERROMAGNETIC ORDERING AND MAGNETORESISTANCE IN THE LAYERED PEROVSKITE LA2-2XCA1+2XMN2O7[J].Physical Review.B.Condensed Matter,1997(9):5395-5403. |
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