Mn位Cr掺杂对亚锰酸盐La_(0.7)Ca_(0.3)MnO_3低场磁电阻影响
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摘要
为了研究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)Ca_(0. 3)Mn_(1-x)Cr_xO_3(x=0,0. 1),测量了两个样品在未加磁场和加0. 25 T磁场的电阻-温度曲线及磁电阻-温度曲线,分析了Mn位Cr掺杂对样品低场磁电阻效应的影响。实验结果表明,随着Cr掺杂量从x=0增加到x=0. 1,样品的金属-绝缘体转变温度逐渐向低温推移,磁电阻峰值温度由T_P≈220 K下降到T_P≈190 K。在0. 25 T磁场下,样品在液氮温区具有较明显的磁电阻效应。
In order to study the magnetoresistance effect of perovskite manganite in low magnetic fields,manganite polycrystalline samples La_(0. 7)Ca_(0. 3)Mn_(1-x)Cr_xO_3( x = 0,0. 1) were prepared by solid-state reaction technique. Resistance-temperature curves and magnetoresistance-temperature curves of the two samples were measured in zero magnetic field and 0. 25 T magnetic field. Influence of different substitution of Cr for Mn on low field magnetoresistance effects of the samples was analyzed. Experimental results showed that the metal-insulator transition temperature of the samples gradually moved to lower temperature and the magnetoresistance peak temperature of the samples decreased from T_P≈220 K to T_P≈190 K with the increase of Cr doping from x =0 to x= 0. 1. The samples showed large magnetoresistance over liquid nitrogen temperature range in 0. 25 T magnetic field.
In order to study the magnetoresistance effect of perovskite manganite in low magnetic fields,manganite polycrystalline samples La_(0. 7)Ca_(0. 3)Mn_(1-x)Cr_xO_3( x = 0,0. 1) were prepared by solid-state reaction technique. Resistance-temperature curves and magnetoresistance-temperature curves of the two samples were measured in zero magnetic field and 0. 25 T magnetic field. Influence of different substitution of Cr for Mn on low field magnetoresistance effects of the samples was analyzed. Experimental results showed that the metal-insulator transition temperature of the samples gradually moved to lower temperature and the magnetoresistance peak temperature of the samples decreased from T_P≈220 K to T_P≈190 K with the increase of Cr doping from x =0 to x= 0. 1. The samples showed large magnetoresistance over liquid nitrogen temperature range in 0. 25 T magnetic field.
引文
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[13]李莉,王桂英,罗鹏,等.La0.67Ca0.33-xBaxMnO3的电输运性质反常及磁电阻温度稳定性[J].稀有金属,2016,40(5):446.
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[16]郭宏瑞,张铭,严辉.Mn位Ru替代对Pr0.5Ca0.5MnO3电磁特性及磁电阻的影响[J].低温物理学报,2011,33(3):174.
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[19]秦伟,张玉滨,解士杰.有机Co/Alq3/La1-xSrxMn O3(LSMO)器件磁电阻的温度效应研究[J].物理学报,2010,59(5):3494.
[20]王闻琦,王桂英,唐永刚,等.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.
[21]李莉,王桂英,唐永刚,等.(1-x)La0.7Ca0.3MnO3/x Ag磁电阻的温度稳定性[J].稀有金属,2013,37(1):49.
[22]李莉,王桂英,毛强,等.La0.80Sr0.05Na0.15MnO3/x CuO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.
[23]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.
[24]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.
[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,Mc CORMACK 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]王闻琦,严国清,杨杰,等.La1-x(Sr1-yKy)xMnO3的电输运性质及磁电阻的温度稳定性[J].硅酸盐学报,2011,39(12):1958.
[7]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.
[8]张明玉,严国清,唐永刚,等.Ag和K掺杂对La4/5Sr1/5MnO3电输运性质及磁电阻的影响[J].低温物理学报,2012,34(3):200.
[9]杨刚,唐永刚,王桂英,等.Ag掺杂对La0.8Ca0.2MnO3电输运性质及磁电阻的影响[J].稀有金属,2012,36(2):266.
[10]杨杰,唐永刚,王桂英,等.不同烧结温度的La0.8Sr0.05Na0.15MnO3电输运性质及磁电阻的温度稳定性[J].低温物理学报,2013,35(3):187.
[11]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.
[12]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.
[13]李莉,王桂英,罗鹏,等.La0.67Ca0.33-xBaxMnO3的电输运性质反常及磁电阻温度稳定性[J].稀有金属,2016,40(5):446.
[14]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.
[15]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.
[16]郭宏瑞,张铭,严辉.Mn位Ru替代对Pr0.5Ca0.5MnO3电磁特性及磁电阻的影响[J].低温物理学报,2011,33(3):174.
[17]PRASAD B,EGILMEZ M,SCHOOFS F,et al.Nanopillar Spin Filter Tunnel Junctions with Manganite Barriers[J].Nano Letters,2014,14(5):2789.
[18]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.
[19]秦伟,张玉滨,解士杰.有机Co/Alq3/La1-xSrxMn O3(LSMO)器件磁电阻的温度效应研究[J].物理学报,2010,59(5):3494.
[20]王闻琦,王桂英,唐永刚,等.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.
[21]李莉,王桂英,唐永刚,等.(1-x)La0.7Ca0.3MnO3/x Ag磁电阻的温度稳定性[J].稀有金属,2013,37(1):49.
[22]李莉,王桂英,毛强,等.La0.80Sr0.05Na0.15MnO3/x CuO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.
[23]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.
[24]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.