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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.
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Keywords:
- double-layered perovskite manganites /
- I-V nonlinearity /
- magnetic Schottky barrier /
- magnetic-electric coupling
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[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, Brner 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, Brner 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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