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La1–x(Sr1–yKy)xMnO3的电输运性质及磁电阻的温度稳定性

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Abstract:

用固相反应法制备La1–x(Sr1–yKy)xMnO3(x=0.2~0.1,y=0.0,0.2,0.4,0.6,0.8,1.0)系列样品,通过X射线衍射谱,电阻率–温度曲线,磁电阻–温度曲线,研究在A位同时掺入1价、2价元素而保持摩尔比n(Mn3+)/n(Mn4+)不变的La1–x(Sr1–yKy)xMnO3体系的电输运性质及磁电阻的温度稳定性。结果表明在高温区,电阻率出现反常系A位离子的无序度及磁不均匀性对双交换作用所致;电阻率–温度曲线出现的双峰现象系表面相电阻率与体相电阻率竞争的结果;在251~177K,y=0.8样品的磁电阻从8.2%缓慢上升到9.4%,磁电阻的温度稳定性有利于磁电阻的实际应用。

References

[1]  ? PENG Z S, WANG G Y, LIU P, et al. Enhancement of room-temperature magnetoresistance in La0.5Sm0.2Sr0.5MnO3/(Ag2O)x/2 [J]. Rare Met, 2010, 29(1): 45–49.
[2]  ? KOU Z Q, DAI N L, MA X, et al. Enhancement of “intrinsic” magnetoresistance ratio and actiration energy of La0.67Ca0.33MnO3 single crystals by Fe doping [J]. Chin Phys, 2005, 14(8): 1653–1656.
[3]  ? ZIESEN L. Extrinsic magneto transport phenornena in ferromagnetic oxides [J]. Rep Prog Phys, 2005, 65(2): 143–249.
[4]  ? 张国庆, 姜勇. 择优掺杂的La–Ca–Na–Mn–O体系的庞磁电阻效应[J]. 中国稀土学报, 2009, 27(6): 791–795.
[5]  ZHANG Guoqing, JIANG Yong. J Chin Rare Earth Soc, 2009, 27(6): 791–795.
[6]  ? 杨应平, 袁松柳. La2/3Cay3Mn1–xCnxO3系统双电阻峰的机理研究[J]. 武汉理工大学学报, 2006, 30(4): 642–645.
[7]  YANG Yingping, YUAN Songliu. J Wuhan Univ Technol, 2006, 30(4): 642–645.
[8]  ? HELMOLT R VON, WECKER J, HOLZAPFEL B, et al. Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic films [J]. Phys Rev Lett, 1993, 71: 2331–2333.
[9]  ? 陈水源, 赖恒, 肖艳, 等. 二元掺杂系列La–(Ca, Ba)–Mn–O材料巨磁电阻特性研究[J]. 稀有金属材料与工程, 2003, 32(8): 615–620.
[10]  ? 姜勇, 李广, 李建青, 等. La0.5Ca0.5–xBaxMnO3体系中的异常磁电阻行为[J]. 低温物理学报, 2000, 22(2): 130–134.
[11]  JIANG Yong, LI Guang, LI Jianqing, et al. J Low Temp Phys, 2000, 22(2): 130–134.
[12]  ? KHARE N, MONARIL O P, GUPTA A K, et al. Temoperature dependence of magnetoresistance and nonlinear conductance of the bicrystal grain boundary in epitaxial La0.67Ba0.33MnO3 thin films [J]. Appl Phys Lett, 2002, 81(2): 325–327.
[13]  ? SANCHEZ R D, RIVAS J, VAZGUEZ C V, et al. Giant magnetoresistance in fine particle of La0.67Ca0.33MnO3 [J]. Appl Phys Lett, 1996, 68(1): 134–136.
[14]  
[15]  ? GOODENOUGH T B. Colossal magnetoresistance in Ln1–xAxMnO3 perovskite [J]. Aus J Phys, 1999, 52(2): 155–186.
[16]  ? RODRIGUEZ-MARTINEZ L M, ATTFIELD J P. Cation disorder and the metal-insulator transition temperature in manganese oxide perovskites [J]. Phys Rev B, 1998, 58(5): 2426–2429.
[17]  ? RODRIGUEZ-MARTINEZ L M, EHRENBERG H, ATTFIELD J P. Cation size variance effect in high-torierance factor Ln0.7M0.3MnO3 perovskites [J]. J Solid State Chem, 1999, 148(1): 20–25.
[18]  ? 王闻琦, 彭振生, 严国清, 等. 稀土双掺杂锰氧化物La0.5Dy0.2? Sr0.3MnO3的磁性质[J]. 稀有金属, 2008, 32(1): 46–49.
[19]  WANG Wenqi, PENG Zhensheng, YAN Guoqing, et al. J Rare Met, 2008, 32(1): 46–49.
[20]  ? SAHANA M, SINGH R N, SHIRAKUMARA C, et al. Colossal magnetoresistance in epitaxial La1–x–yNay MnO3 thin films [J]. Appl Phys Lett, 1997, 70(21): 2909–2911.
[21]  ? YE S L, SONG W H, DAI J M, et al. Effect of Li Substitution on the crystal structure and magnetoresistance of LaMnO3 [J]. J Appl Phys, 2000, 88(10): 5915–5919.
[22]  ? ABDELMOULA N, CHEIKH-ROUHOU A, REVERSAT L. Strutural, magnetic and magnetoresistance properties of La0.7Sr0.3–xNaxMnO3 manganites [J]. J Phys, 2001, 13(3): 449–458.
[23]  ? BHATTACHARYA S, BANERIEE A, PAL S, et al. Transpore properties of Na-doped La1–xCax–yNayMnO3 measured in a pulsed magnetic field [J]. J Phys, 2002, 14(43): 10221–10235.
[24]  CHEN Shuiyuan, LAI Heng, XIAO Yan, et al. Rare Met Mater Eng, 2003, 32(8): 615–620.
[25]  ? MCCORMACK M, JIN S, TIEFE T H, et al. Very large magnetoresistance in perovskite-like La–Ca–Mn–O thin films [J]. Appl Phys Lett, 1994, 64(22): 3045–3047.

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