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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

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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

Magnetically correlated I-V nonlinearity and electrical transport property of the double-layered perovskite La1.8Ca1.2Mn2O7 compound

Deng Heng, Yang Chang-Ping, Huang Chang, Xu Ling-Fang
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  • 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<
    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.
    • 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.
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    [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 物理学报 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 物理学报 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 物理学报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 物理学报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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出版历程
  • 收稿日期:  2009-11-11
  • 修回日期:  2009-12-07
  • 刊出日期:  2010-05-05

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