高温高压合成电子型掺杂层状钙钛矿结构锰氧化物La2-2xCa1+2xMn2O7

朱嘉林; 禹日成; 李凤英; 靳常青

doi:10.11858/gywlxb.2002.02.002

高温高压合成电子型掺杂层状钙钛矿结构锰氧化物La2-2xCa1+2xMn2O7

doi: 10.11858/gywlxb.2002.02.002

朱嘉林^1,,
禹日成^2,3,
李凤英^2,3,
靳常青^2,3

1.
北京信息工程学院传感技术研究中心，北京 100010；
2.
中国科学院物理研究所极端条件实验室，中国科学院凝聚态物理中心，北京 100080；
3.
中国科学院北京高压科学研究中心，北京 100080

详细信息

通讯作者:
朱嘉林

计量
- 文章访问数: 7789
- HTML全文浏览量: 380
- PDF下载量: 842
出版历程
- 收稿日期: 2001-07-02
- 修回日期: 2002-01-14
- 发布日期: 2002-06-05

High-Pressure and High-Temperature Synthesis of the Electron-Doped Layered Magnates La2-2xCa1+2xMn2O7

1.
Center for Sensor Technology Research, Beijing Information Technology Institute, Beijing 100010, China;
2.
Laboratory for Extreme Condition Physics, Institute of Physics, Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;
3.
Beijing High Pressure Research Center, Beijing 100080, China

More Information

Corresponding author: ZHU Jia-Lin

摘要

摘要: 用高温高压法、在1 260 ℃和5.0 GPa条件下，成功制备出电子型掺杂层状钙钛矿结构锰氧化物La2-2xCa1+2xMn2O7（x=1.0～0.8）系列样品。样品的粉末X射线衍射实验和Rietveld精修结构分析表明，所制样品具有Sr3Ti2O7型四方结构，空间群为I4/mmm。随着电子浓度的增加，MnO6八面体畸变程度增大，晶胞体积增加。同时样品的磁化强度随La的掺入、x的增加而增强，反铁磁有序温度TN提高。由于双交换作用减小，样品的电阻增加。在测量温度范围内，没有观测到磁电阻效应。
- 磁电阻效应 /
- 层状钙钛矿结构 /
- 电子型掺杂锰氧化物 /
- 磁化强度 /
- 电阻率
Abstract: The electron-doped layered magnates with nominal composition La2-2xCa1+2xMn2O7 (x=1.0～0.8) were prepared using a standard solid-state reaction method at a temperature of 1 260 ℃ and a pressure of 5 GPa. The structures of the compounds were investigated using powder X-ray diffraction and Rietveld analysis. The results show that all structures of the samples belong to the Sr3Ti2O7 tetragonal structure with space group of I4/mmm. With the electron concentration increasing, the MnO6 octahedral deformation and the value of the lattice volume increased. Meanwhile, Neel temperature TN and magnetization of the samples increased with the La3+ introduction. The resistivities also increased due to the weakening of double-exchange interaction. No magneto resistance effect was observed in the temperature range of measurement.
- magnetoresistance /
- layered perovskite-like manganates /
- magnetization /
- electron-doped manganite /
- resistivity

HTML全文

参考文献(25)

Hwang H Y, Cheong S-W, Radaelli P G, et al. Lattice Effects on the Magnetoresistance in Doped LaMnO3 [J]. Phys Rev Lett, 1995, 75(50): 914-917.

Mahesh R, Mahendiran R, Raychaudhuri A K, et al. Effect of Dimensionality on the Giant Magnetoresistance of the Manganayes: A Study of the (La, Sr)n+1 MnnO3n+1 Family [J]. J Solid State Chem, 1996, 122: 448-450.

Moritomo Y, Asamitsu A, Kuwahara H, et al. Giant Mangnetoresistance of Manganese Oxides with a Layered Perovskite Structure [J]. Nature, 1996, 380: 141-144.

Kimura T, Tomioka Y, Kuwahara H, et al. Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films [J]. Science, 1996, 274: 1698-1701.

Schiffer P, Ramirez A P, Bao W, et al. Low Temperature Magnetoresistance and the Magnetic Phase Diagram La1-xCaxMnO3 [J]. Phys Rev Lett , 1995, 75(18): 3336-3339.

Zener C. Interaction between the d Shells in the Transition Metals [J]. Phys Rev, 1951, 81: 440-446.

Ruddlesden S N, Popper P. The Compound Sr3Ti2O7 and Its Structure [J]. Acta Crystallogr, 1958, 11: 54-59.

Argyiou D N, Mitchell J F, Radaelli P G, et al. Lattice Effects and Magnetic Structure in the Layered Colossal Magnetoresistance Manganite La2-2xSr1+2xMn2O7 [J]. Phys Rev B, 1999, 59(13): 8695-8702.

Battle P D, Cox D E, Green A M, et al. Sr1. 8Nd1. 2Mn2O7: Synthesis, Crystal Structure, and Physics Properties [J]. Chem Mater, 1997, 9: 3215-3221.

Mitchell J F, Millbum J E, Medarade M, et al . Layered Manganites: Magnetic Structure at Extreme Doping Levels [J]. J Appl Phys, 1999, 85(8): 4352-4354.

Kuboat M, Fujioka H, Hirota K, et al. Relation between Crystal and Magnetic Structures of Layered Manganite La2-2xCa1+2xMn2O7 (0. 30x0. 50) [J]. J Phys Soc Jpn, 2000, 69(6): 1606-1609.

Hur N H, Kim J T, Kim K H, et al. Effect of Lanthanide Ions on the Magnetotransport Properties in Layered Sr1. 6R1. 4Mn2O7(R=La, Pr, Nd, Gd) [J]. Phys Rev B, 1998, 57(17): 10740-10744.

Asano H, Hayakawa J, Matsui M. Giant Magnetoresistance of a Two-Dimensional Ferromagnet La2-2xCa1+2xMn2O7 [J]. Appl Phys Lett, 1996, 68(25): 3638-3640.

Raychaudhuri P, Mitra C, Paramekanti A, et al. The Metal-Insulator Transition and Ferromagnetism in the Electron-Doped Layered Manganites La2-2xCa1+2xMn2O7 (x = 0, 0. 3, 0. 5) [J]. J Phys Condens Matter, 1998, 10: 191-194.

Suryanarayanan R, Zelenay I, Berthon J. Ferromagnetism and Thermoelectric Power of La1.5Ca1.5Mn2O7 [J]. Materials Research Bulletin, 1997, 32(50): 595-601.

Ganguly R, Siruguri V, Gopalakrishnan I K, et al. Comment on Giant Magnetoresistance of a Two-Dimensional Ferromagnet La2-2xCa1+2xMn2O7 [J]. Appl Phys Lett, 2000, 76: 1956-1957.

Hiroyuki F, Manabu I, Shuichi O, et al. Canted Antiferromagnetic Order and Large Magnetoresistance Effect in La1-xCaxMnO3, Pr1-xCaxMnO3 and Other RE1-xAExMnO3 Mangneanese Oxides (x0.9) [J]. J Phys Soc Jpn, 2000, 69: 1865-1871.

Witte N S, Goodman P, Lincoln F J, et al. Electrical and Magnetic Phase of the Layered Perovskite Ca4-xLaxMn3O10[J]. Appl Phys lett, 1998, 72: 853-855.

MacChesney J B, Wiliams H J, Potter J F, et al. Magnetic Study of the Electron-Doped Layered Manganates La2-2xCa1+2xMn2O7 (0. 6x1. 0) [J]. Phys Rev B, 2000, 62(10): 6485-6488.

Fawcett I D, Sunstrom J E IV, Greenblatt M. Structure, Magnetism, and Properties of Ruddlesden-Popper Calcium Manganates Prepared from Citrate Gels [J]. Chem Mater, 1998, 10: 3643-3651.

Park J H, Parise J B. Exploration Chemistry with High-Pressure Temperature [J]. Chem Mater, 1995, 7: 1055-1057.

Fawcett I D, Kim E, Greenblatt M, et al. Properties of the Electron-Doped Layered Manganates La2-2xCa1+2xMn2O7 (0.6x1.0) [J]. Phys Rev B, 2000, 62(10): 6485-6495.

Battle P D, Green M A, Laskey N S, et al. Layered Ruddlesden-Popper Manganese Oxides: Synthesis and Cation Ordering [J]. Chem Mater, 1997, 9: 552-559.

Shannon P R D. Revised Effective Ionic Radii and Systematic Studies of Interatomic Distances in Halides and Chalcogenides [J]. Acta Crystallogr, 1976, A32: 751-773.

Battle P D, Millburn J E, Rosseinsky M J, et al. Neutron Diffraction Study of the Structural and Electronic Properties of Sr2HoMn2O7 and Sr2YMn2O7 [J]. Chem Mater, 1997, 9: 3136-3142.

施引文献

资源附件(0)

访问统计