La位Y掺杂对亚锰酸盐La_(0.7)Sr_(0.3)MnO_3低场磁电阻影响
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摘要
针对钙钛矿亚锰酸盐在较低磁场下的磁电阻效应,采用固相反应法制备了亚锰酸盐多晶样品La_(0.7-x)Y_xSr_(0.3)MnO_3(x=0, 0.1, 0.2),测量了两个样品(x=0, 0.2)的X射线衍射谱及3个样品(x=0, 0.1, 0.2)在未加磁场和加0.25 T磁场的电阻-温度(R-T)曲线和磁电阻-温度(MR-T)曲线,分析了La位Y掺杂对样品低场磁电阻效应的影响。实验结果表明,样品La_(0.7)Sr_(0.3)MnO_3的晶体结构由立方结构向四方结构畸变,样品La_(0.5)Y_(0.2)Sr_(0.3)MnO_3为立方结构。随着La位Y掺杂量从x=0增加到x=0.2,晶格常数减小。在实验温区内,3个样品的R-T曲线没有出现金属-绝缘体转变峰,呈现出金属电阻温度特性。在相同的温度下,3个样品在加磁场时的电阻比未加磁场时的电阻要小,表现为负磁电阻。3个样品的MR-T曲线没有出现峰值温度T_P,磁电阻的大小随温度的降低而增加。在0.25 T磁场下,3个样品在实验温区都具有明显的低场磁电阻效应。为钙钛矿亚锰酸盐在磁电子学领域的应用研究提供了重要参考。
In view of magnetoresistance effect of perovskite manganite in low magnetic field, manganite polycrystalline samples La_(0.7-x)Y_xSr_(0.3)MnO_3(x=0, 0.1, 0.2) were prepared by solid-state reaction technique. X-ray diffraction spectrums of the two samples(x=0, 0.2) and resistance-temperature(R-T) curves and magnetoresistance-temperature(MR-T) curves of the three samples(x=0, 0.1, 0.2) in zero magnetic field and 0.25 T magnetic field were measured. Influence of different substitution of Y for La on low field magnetoresistance effect of the samples was analyzed. Experimental results showed that the crystal structure of the sample La_(0.7)Sr_(0.3)MnO_3 was distorted from cubic structure to tetragonal structure and that of the sample La_(0.5)Y_(0.2)Sr_(0.3)MnO_3 was cubic structure. The lattice constants decreased with the increase of Y doping in La site from x=0 to x=0.2. The R-T curves of the three samples did not appear the metal-insulator transition peak in the experimental temperature range, showing the metal resistance temperature characteristics. At the same temperature, the resistance of the three samples in magnetic field was smaller than that in zero magnetic field, showing the negative magnetoresistance. The MR-T curves of the three samples showed no peak temperature T_P and the magnetoresistance increased with decreasing temperature. The three samples showed obvious low field magnetoresistance effect in the experimental temperature range in 0.25 T magnetic field. This paper provided an important reference for application research of perovskite manganite in the field of magnetoelectronics.
In view of magnetoresistance effect of perovskite manganite in low magnetic field, manganite polycrystalline samples La_(0.7-x)Y_xSr_(0.3)MnO_3(x=0, 0.1, 0.2) were prepared by solid-state reaction technique. X-ray diffraction spectrums of the two samples(x=0, 0.2) and resistance-temperature(R-T) curves and magnetoresistance-temperature(MR-T) curves of the three samples(x=0, 0.1, 0.2) in zero magnetic field and 0.25 T magnetic field were measured. Influence of different substitution of Y for La on low field magnetoresistance effect of the samples was analyzed. Experimental results showed that the crystal structure of the sample La_(0.7)Sr_(0.3)MnO_3 was distorted from cubic structure to tetragonal structure and that of the sample La_(0.5)Y_(0.2)Sr_(0.3)MnO_3 was cubic structure. The lattice constants decreased with the increase of Y doping in La site from x=0 to x=0.2. The R-T curves of the three samples did not appear the metal-insulator transition peak in the experimental temperature range, showing the metal resistance temperature characteristics. At the same temperature, the resistance of the three samples in magnetic field was smaller than that in zero magnetic field, showing the negative magnetoresistance. The MR-T curves of the three samples showed no peak temperature T_P and the magnetoresistance increased with decreasing temperature. The three samples showed obvious low field magnetoresistance effect in the experimental temperature range in 0.25 T magnetic field. This paper provided an important reference for application research of perovskite manganite in the field of magnetoelectronics.
引文
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[2] HELMOLT R.von,WECKER J.,HOLZAPFEL B.,et al.Giant Negative Magneto-resistance in Perovskitelike La2/3Ba1/3MnOx Ferro-magnetic Films[J].Physical Review Letters,1993,71(14):2331.
[3] JIN S.,TIEFEL T.H.,MCCORMACK M.,et al.Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films[J].Science,1994,264(5157):413.
[4] 张光宇,李燕飞.亚锰酸盐La0.7-xYxCa0.3MnO3的电磁特性和磁电阻效应[J].哈尔滨理工大学学报,2002,7(2):101.
[5] 李燕飞,张光宇,桂太龙,等.La0.7-xCexCa0.3Mn O3低场磁电阻的晶格效应[J].低温物理学报,2004,26(2):126.
[6] 陈蕊,冯明,苟喜成,等.La1-xCaxMnO3外延薄膜的制备、结构及磁电阻效应[J].高等学校化学学报,2012,33(11):2385.
[7] 唐永刚,王桂英,毛强,等.烧结温度对La22/27Sr1/27K4/27MnO3的电输运性质及磁电阻的影响[J].硅酸盐学报,2014,42(9):1111.
[8] 吴兆峰.钙钛矿型La0.8MnO3+δ的磁性和磁电阻效应[J].低温物理学报,2016,38(1):39.
[9] SUDYOADSUK T.,SURYANARAYANAN R.,WINOTAI P.,et al.Suppression of Charge-ordering and Appearance of Magnetoresistance in a Spin-cluster Glass Manganite La0.3Ca0.7Mn0.8Cr0.2O3[J].Journal of Magnetism & Magnetic Materials,2003,278(1-2):96.
[10] 江阔.Co掺杂对铁磁金属La0.8Sr0.2MnO3磁电阻影响机理[J].物理学报,2010,59(4):2801.
[11] 郭宏瑞,张铭,严辉.Mn位Ru替代对Pr0.5Ca0.5 MnO3电磁特性及磁电阻的影响[J].低温物理学报,2011,33(3):174.
[12] PRASAD B,EGILMEZ M,SCHOOFS F,et al.Nanopillar Spin Filter Tunnel Junctions with Manganite Barriers[J].Nano Letters,2014,14(5):2789.
[13] PRASAD B,ZHANG W,JIAN J,et al.Strongly Bias-dependent Tunnel Magnetoresistance in Manganite Spin Filter Tunnel Junctions[J].Advanced Materials,2015,27(19):3079.
[14] 秦伟,张玉滨,解士杰.有机Co/Alq3/La1-xSrxMnO3(LSMO)器件磁电阻的温度效应研究[J].物理学报,2010,59(5):3494.
[15] 王闻琦,王桂英,唐永刚,.CuO复合对La0.80Sr0.05K0.15MnO3电输运和磁电阻的影响[J].稀土,2013,34(3):64.
[16] 李莉,王桂英,唐永刚,等.(1-x)La0.7Ca0.3MnO3/xAg磁电阻的温度稳定性[J].稀有金属,2013,37(1):49.
[17] 李莉,王桂英,毛强,等.La0.80Sr0.05Na0.15MnO3/xCuO复合体电输运机制及磁电阻的温度稳定性[J].稀土,2014,35(3):82.
[18] KHAZENI K,JIA Y X,LU Li,et al.Effect of Pressure on the Magnetoresistance of Single Crystal Nd0.5Sr0.36Pb0.14MnO3-δ[J].Physical Review Letters,1996,76(2):295.
[19] SAWADA H,MORIKAWA Y,TERAKURA K.Jahn-Teller Distortion and Magnetic Structures inLaMnO3[J].Physical Review B,1997,56(19):12154.
[20] HASHIMOTO T,ISHIBASHI S,TERAKURA K.Jahn-Teller Distortion and Magnetic Structure inLaMnO3:a First-principles Theoretical Study with Full Structure Optimizations[J].Physical Review B,2010,82(4):1.
[21] 陈勤,范晓娟,季刚,等.La0.7Ca0.3MnO3中的双交换作用与小极化子效应[J].低温物理学报,2000,22(2):156.