报道了A位缺位的钙钛矿锰氧化物(La0.8Sr0.2)1-xMnO3(0≤x≤0.30)多晶样品的相结构、磁性和磁电阻效应.实验表明,当x≥0.20时,化合物主要由磁性钙钛矿相和非磁性Mn3O4相所组成.它们的电阻率随温度的变化曲线均具有双峰特征,高温侧的电阻率峰出现在钙钛矿相的居里温度附近,低温侧的电阻率宽峰则是金属导电性的钙钛矿晶粒和高电阻率的半导体或绝缘体导电性的晶界或相界共同作用的结果.样品的零场电阻率ρ0随着A位缺位量x的增大而增大.适当改变x值,可以改善磁电阻比的温度稳定性.当x=0.30时,化合物磁电阻比MR在一个相对宽的温度范围内(175~328K)基本上保持不变,即MR=(9.1±0.5)%.
参考文献
[1] | Zener C .Rev[J].Physical Review,1951,82:403. |
[2] | Anderson P W;Hasegawa H .[J].Physical Review,1955,100:675. |
[3] | Millis A J;Littlewood P B;Shraiman B I .[J].Physical Review Letters,1996,77:175. |
[4] | Kawano H;Kajimoto R;Yoshizawa H;Tomioka Y;Kuwahara H;Tokura Y;JOINT RES CTR ATOM TECHNOL TSUKUBA IBARAKI 305 JAPAN.;UNIV TOKYO DEPT APPL PHYS BUNKYO KU TOKYO 113 JAPAN. .Magnetic ordering and relation to the metal-insulator transition in Pr1-xSrxMnO3 and Nd1-xSrxMnO3 with x similar to 1/2[J].Physical review letters,1997(22):4253-4256. |
[5] | Jin S;Tiefel T H;Mc Cormack M et al.[J].Science,1994,264:413. |
[6] | Hwang H Y;Cheong S W;Radaelli P G et al.[J].Physical Review Letters,1995,75:914. |
[7] | Darling TW.;Moshopoulou EG.;Trugman SA.;Neumeier JJ. Sarrao JL.;Bishop AR.;Thompson JD.;Migliori A. .Measurement of the elastic tensor of a single crystal of La0.83Sr0.17MnO3 and its response to magnetic fields[J].Physical Review.B.Condensed Matter,1998(9):5093-5097. |
[8] | Louca D.;Egami T. .Local lattice distortions in La1-xSrxMnO3 studied by pulsed neutron scattering[J].Physical Review.B.Condensed Matter,1999(9):6193-6204. |
[9] | Ivanshin V A;Deisenhofer J;Krug H-A yon Nidda et al.[J].Physical Review B,2000,61:6213. |
[10] | Ferris V;Goglio G;Brohan L et al.[J].Materials Research Bulletin,1997,32:763. |
[11] | Frohlich K;Vávra I;Gomory F et al.Mater[J].Journal of Magnetism and Magnetic Materials,2000,211:67. |
[12] | Zhang Ning;Ding Weiping;Zhong Wei et al.[J].Physical Review B,1997,56:8138. |
[13] | Balcells Ll;Carrillo A E;Martinez B et al.[J].Applied Physics Letters,1999,74:4014. |
[14] | Gross R;Alff L;Btchner B et al.Mater[J].Journal of Magnetism and Magnetic Materials,2000,211:150. |
[15] | Von Helmolt R;Haupt L;Barner K et al.[J].Solid State Communications,1992,82:693. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%