本文研究了样品La0.95K0.05MnO3的内耗、直流电阻、交流磁化率.发现在20～275K的温度范围内,在0.3T的磁场下有明显的磁阻(MR)效应,温度为259K时MR效应达到极大值26%.在直流电阻测量中发现267K时出现很尖锐的电阻峰;在220K附近出现"肩峰".内耗温度曲线在210K～250K的温度范围有一个很宽的内耗峰;在268K有一个很明显的内耗蜂同时伴随着模量软化,并且由Kissinger关系求出顺磁-铁磁转变的表观激活能Eap=0.53eV(请说明通过什么公式求出什么东西的活化能).
参考文献
| [1] | JVolger .[J].Physica,1954,20:49. |
| [2] | CWSearie;STWang .[J].Canadian Journal of Physics,1970,48:2023. |
| [3] | CWXiong;QLi;HLJu;RLGreeneandTVSenapati .[J].Applied Physics Letters,1995,66:1689. |
| [4] | CWXiong;QLi;HLJu;SNMo,LSenapati,XXXiandRLGreene .[J].Applied Physics Letters,1995,66:1427. |
| [5] | C. N. R. Rao;A. K. Cheetham;R. Mahesh .Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems[J].Chemistry of Materials,1996(10):2421-2432. |
| [6] | B Raveau;AMaignan;C Martin;and M Herviey .[J].Chemistry of Materials,1998,10:2641. |
| [7] | A J Millis;PBLittlewood;BIShraiman .[J].Physical Review Letters,1995,74:5144. |
| [8] | A J Millis;BIShraiman;R Mueller .[J].Physical Review Letters,1996,77:175. |
| [9] | A J Millis .[J].Physical Review,1996,B53:8434. |
| [10] | L Q Zheng;Q F Fang .[J].Journal of Physics:Condensed Matter,2001,13:1. |
| [11] | G T Wang;Q F Fang .[J].Physica Status Solidi,2002,191:260. |
| [12] | ASimpoulos;MPissas;GKallias;EDevlin,NMoutis,IPangaiotopoulos,DNiarchosandCChristides .[J].Physical Review,1999,B59:1263. |
| [13] | GKallias;MPissasEDevlin;ASimpoulos;DNiarchos .[J].Physical Review,1999,B59:1272. |
| [14] | AVBoris;NNKovaleva;AVBazhenov .[J].S-W Cheong Phys Rev,1999,B59:697. |
| [15] | KKumagai;AIwai;YTomioka;HKuwahara,YTokura,andAYakubovskii .[J].Physical Review,1999,B59:97. |
| [16] | Ji Gang;ZhangJianhui;Fan Xiaojuan;DiaoJiedong LiuWei LiXiaoguang .[J].Chin Journal of Low Temp Phys,1998,20:224. |
| [17] | X.-G. Li;H. Chen;C. F. Zhu .Ultrasonic study on charge ordering, magnetic, and structural changes in La_(0.25)Ca_(0.75)Mn_(0.93)Cr_(0.07)O_(3)[J].Applied physics letters,2000(9):1173-1175. |
| [18] | CF Zhu;RK Zheng .[J].Physical Review,1999,B59:11169. |
| [19] | CF Zhu;RK Zheng .[J].Applied Physics Letters,1999,74:3504. |
| [20] | Zhu Changfei;ZhengRenkui;Zhang Jianhui;LiXiaoguang .[J].Chin J Low Temp Phys(in Chinese),1999,21(03):178. |
| [21] | M Shana;MSHegde;C Shivakumara .[J].Journal of Solid State Chemistry,1999,148:342. |
| [22] | K Q Wang;YXWang;A Junod;K Q Ruan and G G Qian .[J].Physica Status Solidi,2001,B223:673. |
| [23] | J M D Coey;Mviret;Lranno .[J].Physical Review Letters,1995,75:R3910. |
| [24] | J. R. Sun;G. H. Rao;J. K. Liang .Crystal structure and electronic transport property of perovskite manganese Oxides with a fixed tolerance factor[J].Applied physics letters,1997(13/16):1900-1902. |
| [25] | G H Rao;JRSun;J K Liang;WYZhou .[J].Physical Review,1997,B55:3742. |
| [26] | J Alonso;EHerreo;J M Gonzalez-Calbet .[J].Phys Rev,2000,B62:11328. |
| [27] | S. L. Ye;W. H. Song;J. M. Dai .Effect of Li substitution on the crystal structure and magnetoresistance of LaMnO_(3)[J].Journal of Applied Physics,2000(10):5915-5919. |
| [28] | H E Kissinger .[J].Annual Chem,1975,29:1702. |
| [29] | L Q Zheng;Q F Fang .[J].Physica Status Solidi,2001,185:267. |
| [30] | S L Ye;WHSong;J M Dai;SGWang,KYWang,CLYuanandYPSun .[J].Journal of Applied Physics,2000,90:2943. |
| [31] | X. W. Li;A. Gupta;Gang Xiao .Low-field magnetoresistive properties of polycrystalline and epitaxial perovskite manganite films[J].Applied physics letters,1997(5/8):1124-1126. |
| [32] | 谢津桥,吴鸿毅,苏金瑞,钱天,朱长飞.La0.9Na0.1MnO3的反常超声特性[J].低温物理学报,2002(04):298-302. |
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%