钙钛矿锰氧化物(La1-xEux)4/3Sr5/3Mn2O7(x=0, 0.15)的磁性和电性研究

何利民; 冀钰; 鲁毅; 吴鸿业; 张雪峰; 赵建军

doi:10.7498/aps.63.147503

摘要

通过传统固相反应法制备了钙钛矿锰氧化物（La1-xEux）4/3Sr5/3Mn2O7（x=0，0.15）多晶样品，并且对其磁性和电性进行了研究. 磁性测量表明：随着温度的降低，样品经历了一个复杂的转变过程，在温度为T*时经历二维短程铁磁有序转变，在温度为TC时进入三维长程铁磁态. 随着Eu的掺杂，T*和TC减小，并且样品（La0.85Eu0.15）4/3Sr5/3Mn2O7 在低温区表现出自旋玻璃行为. 电性质测量表明：在母体La4/3Sr5/3Mn2O7中La 位掺杂Eu后电阻率明显变大，金属绝缘转变温度TMI降低，磁电阻峰值增大. 这些影响归因于较小的Eu3+离子替代La3+离子导致平均离子半径减小，晶格发生畸变. 此外，较小的Eu3+离子优先占据层间岩盐层的R-site，使La3+，Sr3+，Eu3+离子在（La0.85Eu0.15）4/3Sr5/3Mn2O7 中的分布更加有序，所以x=0.15的样品的ρ-T曲线只有一个峰.

关键词:

磁性 /
电性 /
磁电阻 /
金属绝缘转变

Abstract

The samples (La1-xEux)4/3Sr5/3Mn2O7 (x=0, 0.15) were prepared by the traditional solid-state reaction, and their magnetic and electrical properties were investigated. The magnetzation measurement reveals that as temperature lowers, all the samples undergo a complex magnetic transition process: they transform from the two-dimensional short-range ferromagnetic order at T* into the three-dimensional long-range ferromagnetic state at TC. With the increase of Eu doping, T* and TC are both reduced, and the sample (La0.85Eu0.15)4/3Sr5/3Mn2O7 exhibits spin-glass-like behaviour in a low temperature region. Electrical property measurements show that with the increase of Eu concentration, resistivity sharply increases, the metal-insulator transition temperature decreases and the magnetoresistance peak increases. These effects are attributed to the decrease of the average ionic radius diminution and the lattice distortion due to the substitution of the smaller Eu3+ ions for La3+ ions. In addition, the small-sized Eu3+ ion preferentially occupies the R site in the rock-salt layer, then the distributions of La3+, Sr3+, Eu3+ ions in the sample (La0.85Eu0.15)4/3Sr5/3Mn2O7 should be more orderly, so there is only one peak in the ρ-T curve of the sample with x=0.15.

Keywords:

作者及机构信息

1.
包头师范学院物理科学与技术学院, 内蒙古磁学与磁性材料重点实验室, 包头 014030;

2.
内蒙古科技大学, 内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室, 包头 014010

基金项目: 国家自然科学基金（批准号：11164019，11064008）、内蒙古自治区科学基金（批准号：2011MS0108，2011MS0101）、内蒙高校科学研究基金（批准号：NJZZ11166，NJ10163，NJZY12202）资助的课题.

Authors and contacts

1.
Inner Mongolia Key Laboratory of Magnetism and Magnetic Materials, Department of Physics, Baotou Normal University, Baotou 014030, China;

2.
Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources: Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11164019, 11064008), the Inner Mongolia Natural Science Foundation, China (Grant Nos. 2011MS0108, 2011MS0101), and the Science Foundation of the Inner Mongolia Higher Education Institutions of China (Grant Nos. NJZZ11166, NJ10163, NJZY12202).

参考文献

[1]	Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039
[2]	Zhao J J, Xing R, Lu Y, Haosi B Y, Zhao M Y, Jin X, Zheng L, Ning W, Sun Y, Cheng Z H 2008 Chin. Phys. B 17 2721
[3]	Zhao J J, Lu Y, Haosi B Y, Xing R, Yang R F, Li Q A, Sun Y, Cheng Z H 2008 Chin. Phys. B 17 2717
[4]	Wang G Y, Guo H Y, Mao Q, Yang G, Peng Z S 2010 Acta Phys. Sin. 59 8883 (in Chinese) [王桂英, 郭焕银, 毛强, 杨刚, 彭振生 2010 物理学报 59 8883]
[5]	Moritomo Y, Asamitsu A, Kuwahara H, Tokura Y 1996 Nature 380 141
[6]	Han L A, Chen C L, Dong H Y, Wang J Y, Gao G M, Luo B C 2008 Acta Phys. Sin. 57 541 (in Chinese) [韩立安, 陈长乐, 董慧迎, 王建元, 高国棉, 罗炳成 2008 物理学报 57 541]
[7]	Chattopadhyay S, Giri S, Majumdar S 2012 J. Appl. Phys. 112 083915
[8]	Kimura T, Tomioka Y, Kuwahara H, Asamitsu A, Tamura M, Tokura Y 1996 Science 274 1698
[9]	Argyriou D N, Mitchell J F, Radaelli P G, Bordallo H N, Cox D E, Medarde M, Jorgensen J D 1999 Phys. Rev. B 59 8695
[10]	Yang R F, Sun Y, He W, Li Q A, Cheng Z H 2007 Appl. Phys. Lett. 90 032502
[11]	Dho J H, Kim W S, Hur N H 2001 Phys. Rev. B 65 024404
[12]	Zhang J, Wang F W, Zhang P L, Yan Q W 2000 Mater. Sci. Eng. B 76 6
[13]	Wang A H, Liu Y, Zhang Z Y, Long Y, Cao G H 2004 Solid State Commun. 130 293
[14]	Asano H, Hayakawa J, Matsui M 1997 Phys. Rev. B 56 5395
[15]	Liu L, Xia Z C, Yuan S L 2006 Mater. Sci. Eng. B 127 55

施引文献

[1]	Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039
[2]	Zhao J J, Xing R, Lu Y, Haosi B Y, Zhao M Y, Jin X, Zheng L, Ning W, Sun Y, Cheng Z H 2008 Chin. Phys. B 17 2721
[3]	Zhao J J, Lu Y, Haosi B Y, Xing R, Yang R F, Li Q A, Sun Y, Cheng Z H 2008 Chin. Phys. B 17 2717
[4]	Wang G Y, Guo H Y, Mao Q, Yang G, Peng Z S 2010 Acta Phys. Sin. 59 8883 (in Chinese) [王桂英, 郭焕银, 毛强, 杨刚, 彭振生 2010 物理学报 59 8883]
[5]	Moritomo Y, Asamitsu A, Kuwahara H, Tokura Y 1996 Nature 380 141
[6]	Han L A, Chen C L, Dong H Y, Wang J Y, Gao G M, Luo B C 2008 Acta Phys. Sin. 57 541 (in Chinese) [韩立安, 陈长乐, 董慧迎, 王建元, 高国棉, 罗炳成 2008 物理学报 57 541]
[7]	Chattopadhyay S, Giri S, Majumdar S 2012 J. Appl. Phys. 112 083915
[8]	Kimura T, Tomioka Y, Kuwahara H, Asamitsu A, Tamura M, Tokura Y 1996 Science 274 1698
[9]	Argyriou D N, Mitchell J F, Radaelli P G, Bordallo H N, Cox D E, Medarde M, Jorgensen J D 1999 Phys. Rev. B 59 8695
[10]	Yang R F, Sun Y, He W, Li Q A, Cheng Z H 2007 Appl. Phys. Lett. 90 032502
[11]	Dho J H, Kim W S, Hur N H 2001 Phys. Rev. B 65 024404
[12]	Zhang J, Wang F W, Zhang P L, Yan Q W 2000 Mater. Sci. Eng. B 76 6
[13]	Wang A H, Liu Y, Zhang Z Y, Long Y, Cao G H 2004 Solid State Commun. 130 293
[14]	Asano H, Hayakawa J, Matsui M 1997 Phys. Rev. B 56 5395
[15]	Liu L, Xia Z C, Yuan S L 2006 Mater. Sci. Eng. B 127 55

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