研究了各种不同 A位离子半径大小的钙钛矿型锰氧化物,分析了其对于材料的金属-绝缘 体相变温度的影响,提出应将此类材料分成较大 eg电子带宽和低 eg电子带宽两类来考虑,并对这 两类材料随 A位 R3+( R=La,Pr...)离子和 M2+ (M=Ca,Sr...)离子的不同半径大小显示出的不 同规律给出了定性的解释.
参考文献
| [1] | Kusters R M;Singleton J;Kee D A et al.Magnetoresis- tance measurements on the magnetic semiconductor Nd0 5Pb0.5MnO3[J].Physical Review B,1989,155:362. |
| [2] | Goodenough J B;Longo J M.Landolt- Bornstein Tabellen[M].Berlin:Springer Press,1970 |
| [3] | Hwang H Y;Cheong S W;Radaelli P G et al.Lattice effects on the magnetoresistance in doped LaMnO3[J].Physical Review Letters,1995,75:914. |
| [4] | Rodrigugz - Martinez M Lide;Attfield J Pual .Cation disorder and size effect in magnetoresistive manganese oxide perovskites[J].Physical Review B,1996,54:R15622. |
| [5] | Sun JR;Rao GH;Liang JK .Crystal structure and electronic transport property of perovskite manganese oxides with a fixed tolerance factor[J].Applied physics letters,1997(14):1900-1902. |
| [6] | Elbio Dagotto;Takashi Hotta;Adriana .Spital state and giant magnetoresistance in perovskite Mn oxides[J].Physics Reports,2001,344:1-153. |
| [7] | Jiark Z;Krupicka;Simsa S et al.Double degeneracy and Jahn-Teller sffects in colossal-magnetoresistance perovskites[J].Journal of Magnetism and Magnetic Materials,1985,53:153. |
| [8] | R der H;Zhang Jun;Bishop A R .Lattice effects in the colossal- magnetoresistance manganites[J].Physical Review Letters,1996,76:1356. |
| [9] | Takashi Hotta;Elbio Dagotto .Competition between ferromagnetic and charge- orbital ordered phases in Pr1- xCaxMnO3 for x=1/4 3/8,and 1/2[J].Physical Review B,2000,61:R11879. |
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