钙钛矿型锰氧化物(La0.8Eu0.2)4/3Sr5/3Mn2O7的磁性和电性研究

万素磊; 何利民; 向俊尤; 王志国; 邢茹; 张雪峰; 鲁毅; 赵建军

doi:10.7498/aps.63.237501

摘要

采用传统固相反应法制备钙钛矿型锰氧化物 (La0.8Eu0.2)4/3Sr5/3Mn2O7多晶样品, X-射线衍射分析表明, 样品(La0.8Eu0.2)4/3Sr5/3Mn2O7结构呈现良好的单相. 通过磁化强度随温度的变化曲线(M-T)、不同温度下磁化强度随磁场的变化曲线(M-H)和电子自旋共振谱发现: 在300 K以下, 随着温度的降低, 样品先后经历了二维短程铁磁有序转变 (TC2D ≈ 282 K)、三维长程铁磁有序转变(TC3D ≈ 259 K)、奈尔转变(TN ≈ 208K)和电荷有序转变(TCO ≈ 35 K); 样品 (La0.8Eu0.2)4/3Sr5/3Mn2O7在TN以下, 主要处于反铁磁态; 在TC3D达到370 K时, 样品处于铁磁-顺磁共存态, 在370 K以上时样品进入顺磁态. 此外, 分析电阻率随温度的变化曲线(ρ-T)得到: 样品在金属-绝缘转变温度(TP ≈ 80 K)附近出现最大磁电阻值, 其位置远离TC3D, 表现出非本征磁电阻现象, 其磁电阻值约为61%. 在TCO以下, 电阻率出现明显增长, 这是由于温度下降使原本在高温部分巡游的eg电子开始自发局域化增强所致. 通过对 (La0.8Eu0.2)4/3Sr5/3Mn2O7的ρ-T 曲线拟合, 发现样品在高温部分的导电方式基本遵循小极化子的导电方式.

关键词:

Abstract

Samples of (La0.8Eu0.2)4/3Sr5/3Mn2O7 were prepared by solid state reaction method. X-ray diffraction patterns indicated that the sample shows no any asymmetry and no any trace of secondary phase. The magnetization curve as a function of temperature (M-T), the magnetization versus magnetic field (M-H) at different temperatures, and the electron spin resonance spectrum have been detected. The magnetization measurement reveals that with lowing temperature, all of the samples undergo a complex magnetic transition. They transform from the two-dimensional short-range ferromagnetic order at TC2D ≈ 282 K, and enter the three-dimensional long-range ferromagnetic state at TC3D ≈ 259 K. Then they step into the antiferromagnetic state at TN ≈ 208 K and enter electric charge temperature order at TCO ≈ 35 K. The antimagnetic phase is found in the sample (La0.8Eu0.2)4/3Sr5/3Mn2O7below TN. When TC3D=370 K, the paramagnetic phase and antimagnetic phase co-exist. When TC3D is above 370 K, only paramagnetic phase exists in the sample. Besides, through electrical resistivity versus temperature curve ρ-T, the sample shows the maximum magnetization electrical resistivity when metal-insulator transition temperature is reached TP ≈ 80 K, TP being far from TC3D. And the transition shows the phenomenon of intrinsic magnetization electrical resistance, MR ≈ 61%. The resistance begins to increase below TCO. Because of the lowing temperature, the itinerant electron eg becomes increasingly spontaneously localized. One can see from the fitted ρ-T curves that (La0.8Eu0.2)4/3Sr5/3Mn2O7 in high temperature range is in accordance with the small polaron mode range hopping conduction.

Keywords:

作者及机构信息

1.
内蒙古科技大学包头师范学院物理科学与技术学院, 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)、内蒙古自治区科学基金(批准号:2011MS0108,2011MS0101)和内蒙古自治区高等学校科学研究基金(批准号:NJZZ11166,NJ10163,NJZY12202)资助的课题.

Authors and contacts

1.
School of Physical Science and Technology, Baotou Normal University, Inner Mongolia University of Science and Technology, Baotou 014030, China;

2.
Key Laboratory of Integrated Exploitation of Bayan Obo Muti-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11164019), the Science Foundation of Inner Mongolia Autonomous Region, China (Grant Nos. 2011MS0108, 2011MS0101), and the Science Research Fund of Institution of Higher Education of Inner Mongolia Autonomous Region, China (Grant Nos. NJZZ11166, NJ10163, NJZY12202).

参考文献

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施引文献

[1]	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. 17 2721
[2]	Imada M, Fujimori A, Tokura Y 1998 Rev. Mod. Phys. 70 1039
[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. 17 2717
[4]	Jonker G H 1956 Physica 22 707
[5]	Jonker G H, van Santen J H 1950 Physica 16 337
[6]	Searle C W, Wang S T 1969 Can. J. Phys. 47 2703
[7]	Ram R A M, Ganguly P, Rao C N R 1987 J. Sol. Stat. Chem. 70 82
[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, Jorgensen J, Goodenough J, Cox D, Bordallo H 1999 Phys. Rev. B 59 8695
[10]	Deisenhofer J, Braak D, Krug von Nidda H A, Hemberger J, Eremina R M, Ivanshin V A, Balbashov A M, Jug G, Loidl A, Kimura T, Tokura Y 2005 Phys. Rev. Lett. 95 257202
[11]	Yang R F, Sun Y, He W, Li Q A, Cheng Z H 2007 Appl. Phys. Lett. 90 032502
[12]	Battle P D, Green M A, Laskey N S, Millburn J E, Murphy L, Rosseinsky M J, Sullivan S P, Vente J F 1997 Mater. Chem. 7 977
[13]	Zhang J, Wang F W, Zhang P L, Yan Q W 2000 Mater. Sci. Eng. B 76 6
[14]	Joonghoe D, Kim W S, Hur N H 2001 Phys. Rev. B 65 024404
[15]	Ma X, Kou Z Q, Di N L, Li Q A, Cheng Z H 2005 J. Magn. Magn. Mater. 285 439
[16]	Wang F, Gukasov A, Moussa F, Hennion M, Apostu M, Suryanarayanan R, Revcolevschi A 2003 Phys. Rev. Lett. 91 47204
[17]	Chen C X 2005 J. Inorg. Mater. 20 1 (in Chinese) [陈春霞 2005 无机材料学报 20 1]
[18]	Wang H J, Zheng L, Xing R, Zhao J J, Lu Y, Cheng Z H 2012 Sin. China: Phys. Mech. Astron. 42 695 (in Chinese) [王洪金, 郑琳, 邢如, 赵建军, 鲁毅, 成昭华 2012 中国科学: 物理学力学天文学42 695]
[19]	Zhao J J, Xing R, Lu Y, Hao S B Y E, Zhao M Y, Jin X, Zheng L, Ning W, Sun Y, Cheng Z H 2008 Chin. Phys. B 17 2721
[20]	Zhou M, Wu H Y, Wang H J, Zheng L, Zhao J J, Lu Y 2012 Physica B 407 2219
[21]	Liu L 2005 Ph. D. Dissertation (Wuhan: Huazhong University of Science and Technology) (in Chinese) [刘莉 2005 博士学位论文(武汉: 华中科技大学)]

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