双层钙钛矿La1.8Ca1.2Mn2O7磁性相关I-V非线性与电输运性质

邓恒; 杨昌平; 黄昌; 徐玲芳

doi:10.7498/aps.59.7390

摘要

采用传统固相反应法制备了双层钙钛矿结构锰氧化物La1.8Ca1.2Mn2O7陶瓷,并用X射线粉末衍射法,扫描电镜,HL5500PC Hall效应分析仪和综合物性测量系统(PPMS)对其磁、电性质进行了表征.结果表明:经过两次高温烧结可合成具有双层Sr3Ti2O7型四方结构的La1.8Ca1.2Mn2<

关键词:

The double-layered perovskite La1.8Ca1.2Mn2O7 ceramic was synthesized by traditional solid-state reaction after heat treatment for two times at high temperature. Its structure, magnetic and electrical properties were characterized by x ray diffraction (XRD), scanning electron microscopy (SEM), HL5500PC and physical properties measurement system (PPMS). It has a double-layered Sr3Ti2O7 tetragonal structure with lattice constants a, b=3.901 (1 =0.1 nm) and c=19.369 , and unit cell volume V=295.21 3. The Curie temperature TC is 177 K. The I-V characteristic shows a nonlinearity increasing with decreasing temperature at low temperatures below the magnetic critical point of TC and the nonlinear coefficient α goes up to a maximum of 68.6 when the temperature goes down to the lowest of 14 K in this experiment. However, the nonlinearity disappears when temperature goes above the magnetic transition point of TC. It indicates that a magnetically correlated Schottky barrier between grain boundaries is responsible for the I-V nonlinearity when temperature is below the Curie temperature. A maximum value of 0.18 eV was obtained for the magnetic Schottky barrier at 14 K after using a back to back pn junction model to describe such a potential barrier between grain boundaries.

Keywords:

作者及机构信息

(1)湖北大学物理学与电子技术学院,铁电压电材料与器件湖北省重点实验室,武汉 430062; (2)湖北大学物理学与电子技术学院,铁电压电材料与器件湖北省重点实验室,武汉 430062,燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛 066004

基金项目: 国家自然科学基金(批准号:10774040,0911120055)和教育部新世纪优秀人才支持计划(批准号:NCET-08-0674)资助的课题.

Authors and contacts

(1)The Faculty of Physics and Electronic Technology and Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China; (2)The Faculty of Physics and Electronic Technology and Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China, State Key Laboratory of Metastable Materials Science and Technology, Yan

参考文献

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施引文献

[1]	Millis A J, Littlewood P B, Shraiman B I 1995 Phys. Rev. Lett. 74 5144
[2]	Argyriou D N, Mitchell J F, Potter C D, Hinks D G, Jorgensen J D, Bader S D 1996 Phys. Rev. Lett. 76 3826
[3]	Yang C P, Morchshakov V, Troyanchuk I O, Rao G H, Brner K 2004 J. Alloys Compd. 383 45
[4]	Yang C P, Chen S S, Zhou Z H, Xu L F, Wang H, Hu J F, Morchshakov V, Brner K 2007 J. Appl. Phys. 101 063909-1
[5]	Wang S L, Chen C L, Wang Y L, Jin K X, Wang Y C, Song Z M 2004 Acta Phys. Sin. 53 587 (in Chinese) [汪世林、陈长乐、王跃龙、金克新、王永仓、宋宙模 2004 53 587]
[6]	Jiang K, Li H F, Gong S K 2006 Acta Phys. Sin. 55 1435 (in Chinese) [江阔、李合非、宫声凯 2006 55 1435]
[7]	Xiao C T, Han L A, Xue D S, Zhao J H, Kunkel H, Williams G 2003 Acta Phys. Sin. 52 1245 (in Chinese) [肖春涛、韩立安、薛德胜、赵俊慧、Kunkel H、Williams G 2003 52 1245] 〖8] Schiffer P, Ramirez A P, Bao W, Cheong S W 1995 Phys. Rev. Lett. 75 3336
[8]	Zener C 1951 Phys. Rev. 81 440
[9]	Ruddlesden S N, Popper P 1958 Acta Cryst. 11 54
[10]	Kimura T, Tomioka Y, Kuwahara H, Asamitsu A, Tamura M, Tokura Y 1996 Science 274 1698
[11]	Asano H, Hayakawa J, Matsui M 1998 Phys. Rev. B 57 1052
[12]	Moritomo Y, Asamitsu A, Kuwahara H, Tokura Y 1996 Nature 380 141
[13]	Kimura T, Asamitsu A, Tomioka Y, Tokura Y 1997 Phys. Rev. Lett. 79 3720
[14]	Han L A, Chen C L, Dong H Y, Wang J Y, Gao G M, Luo B C 2008 Acta Phys. Sin. 57 0541 (in Chinese) [韩立安、陈长乐、董慧迎、王建元、高国棉、罗炳成 2008 57 0541]
[15]	Zhou T J, Yu Z, Du Y W 2001 Phys. Lett. A 282 209
[16]	Asano H, Hayakawa J, Matsui M 1997 Phys. Rev. B 56 5395
[17]	Gupta A K, Kumar V, Khare N 2007 Solid State. Sci. 9 817
[18]	Hwang H, Cheong S W, Ong N P, Batlogg B 1996 Phys. Rev. Lett. 77 2041
[19]	Furukawa N 1997 J. Phys. Soc. Jpn. 66 2523
[20]	Chung S Y, Kim I D, Kang S J L 2004 Nat. Mater. 3 774

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