采用传统的高温固相法制备了多晶样品(La1-xGdx)0.5Sr0.5MnO3(x=0,0.1,0.2,0.3,0.4),利用X射线衍射仪(XRD)、超导量子磁强计(SQUID)、标准四端引线法分别对样品结构、磁性、电性以及磁电阻效应进行了研究.研究表明:Gd的少量替代并没有引起结构变化;随着Gd含量的增加,所有样品的居里温度Tc和金属-绝缘体转变温度Tp都降低了;在Tc附近发现了磁电阻效应,同时在低温下发现了更大的磁电阻;并且Gd的少量替代可使磁电阻MR增大.
参考文献
| [1] | Jin S;Teifel T H;McCormack M;Fastnacht R A Ramesh R Chen L H .Thousandfold change in resistivity in magnetoresistive La-Ca-Mn-O films[J].Science,1994,264(5157):413. |
| [2] | 戴道生;熊光成;吴思诚.RE1-xTxMnO3氧化物的结构,电磁特性和巨磁电阻[J].物理学进展,1997(17):201. |
| [3] | 彭振生.La2/3Ca1/3MnO3中的输运机制与CMR效应[J].中国稀土学报,2003(06):664-667. |
| [4] | 刘建,张炳哲,张伟,丁铁柱.（La1-xREx）2/3Sr1/3MnO3（RE=Y,Sm,Eu,Tb;x=0.1～0.5）的晶体结构及磁性质研究[J].中国稀土学报,2004(06):765-768. |
| [5] | Zener C .Ferromagnetic compounds of manganese with perovskite.structure[J].Physical Review,1951,82(03):403. |
| [6] | Zener C .Interaction between the d-shells in the transition metals[J].Physical Review,1951,81:440. |
| [7] | Millis A J;Littlewood P B;Shraiman B I .Double exchange alone does not explain the resistivity of La1-xSrxMnO3[J].Physical Review Letters,1995,74(25):5144. |
| [8] | Nagaev E L .Phase-separation mechanism for giant magnetoresistanee of lanthanum manganites[J].Physics Letters A,1996,218(3-6):367. |
| [9] | Volger J .Further experimental investigations on some ferromagnetic oxidic compounds of manganese with perovskite structure[J].Physica,1954,20(1-6):49. |
| [10] | Hwang H Y;Cheong S W;Ong N P;Batlogg B .Spin-polarized intergrain tunneling in La2/3Sr1/3MnO3[J].Physical Review Letters,1996,77(10):2041. |
| [11] | 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. |
| [12] | De Teresa J M;Ibarra M R;García J;Bhsco J Ritte rC Algar abel P A Marquina C Del Moral A .Spin-glass insulator state in(Tb-La)2/3Ca1/3MnO3 perovskite[J].Physical Review Letters,1996,76:3392. |
| [13] | Terai T;Kakeshita T;Fukuda T;Kindo K,Honda M,Kishio K .Electronic and magnetic properties and phase diagrams of (La1-xRx)0.7Ca0 3MnO3 compounds with R=Sm,Gd,Ho or Er[J].PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANIC,2002,82(10):1099. |
| [14] | Terai T.;Fukuda T.;Saburi T.;Takamoto N.;Kindo K.;Honda M.;Kakeshita T. .Electronic and magnetic properties of (La-Dy)(0.7)Ca0.3MnO3[J].Physical Review.B.Condensed Matter,1998(22):14908-14912. |
| [15] | Goodenough J B;Lango J M.Magnetic and other properties of oxides and related compounds Landolt-Boorustein Tabellen[M].Beilin:Springer-Verlag,1970 |
| [16] | Tokura Y;Tomioka Y .Colossal magnetoresistive manganites[J].Journal of Magnetism and Magnetic Materials,1999,200:1. |
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