R型铁氧体BaFe4-xTi2+xO11的化学组态以及磁性行为的研究

胡亚亚; 朱媛媛; 周贝贝; 刘硕; 刘雍; 熊锐; 石兢

doi:10.7498/aps.64.117501

摘要

本文通过传统的固相反应法制备了R型六角铁氧体BaFe4-xTi2+xO11 (x= 0, 0.25, 0.5, 0.75, 1), 并且对它的原子价态以及磁性行为进行了研究. X 射线光电子能谱(XPS)结果显示了随着掺杂含量的增加, 体系中Fe3+离子逐渐减少而Fe2+离子逐渐增加. 由于具有非对称结构的阻挫晶格中存在各种关联作用的竞争, 使得BaFe4-xTi2+xO11体系表现出了复杂的磁有序行为, 在T1～250 K和T2～83 K两处存在磁转变. 对这一系列掺杂样品, 在相变温度T1之上表现顺磁行为, 而在相变温度T2前后的磁化强度都表现出低场下随磁场的增加快速增加, 高场下则线性变化且在5104 Oe时还未达到饱和的行为, 表明这一系列掺杂样品是典型的倾斜反铁磁态(canted antiferromagnetic) 或者亚铁磁态.

关键词:

Abstract

In this paper, polycrystalline BaFe4-xTi2+xO11 (x=0, 0.25, 0.5, 0.75, 1) samples have been synthesized by the conventional solid-state reaction method. X-ray diffraction (XRD) patterns of all the samples show that the diffraction peaks correspond to that of an R-type hexagonal ferrite structure, and no trace of second phase is detected. Measurement of X-ray photoelectron spectroscopy (XPS) reveals that most of the Fe ions in BaFe4Ti2O11 are trivalent and the fitting of two peaks in Fe 2p spectrum corresponding to different Fe ion sites, while the amount of Fe2+ ions increases with the increase of Ti ions in BaFe4-xTi2+xO11. The spectroscopy of Ti ions confirms that the valence of Ti in BaFe4-xTi2+xO11 are tetravalent. Magnetic susceptibility of BaFe4-xTi2+xO11 (x= 0, 0.25, 0.5, 0.75, 1) reveals two magnetic transitions at T1～250 K and T2～83 K, which indicate a complex magnetic order driven by competing interactions on a frustrated lattice with a noncentrosymmetric structure. For all the samples, the magnetic susceptibility obeys Curie-Weiss law above T1, and M-H curves exhibit a linear variation with magnetic field in this temperature range, which is consistent with the paramagnetic behavior. A decrease of the effective magnetic moment is due to the increase of Fe2+ ions with the increase of Ti content in BaFe4-xTi2+xO11. Below T1, the magnetization curve as a function of temperature (M-T) and the magnetization versus magnetic field (M-H) at different temperatures imply its characteristic of a typical canted antiferromagnetic or ferrimagnetic state. Meanwhile, the transition temperature T2 drops gradually with the increase in Ti content, which might be related to the change of occupying of Fe ions in the kagome layers.

Keywords:

作者及机构信息

1.
武汉大学物理科学与技术学院, 武汉 430072

基金项目: 国家重点基础研究发展计划(973计划)(批准号:2012CB821404)、国家自然科学基金(批准号:11474224,11474225)和高等学校博士学科点专项科研基金(批准号:20110141110007)资助的课题.

Authors and contacts

1.
School of Physics and Technology, Wuhan University, Wuhan 430072, China

Funds: Project supported by the National Basic Research Program of China (Grant No. 2012CB821404), the National Natural Science Foundation of China (Grant Nos. 11474224, 11474225), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110141110007).

参考文献

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施引文献

[1]	Grundler D 2002 Grundler D 2002 Phys. World 15 39
[2]	Awschalom D D, Flatt M E, Samarth N 2002 Sci. Am. 286 66 Sci. Am. 286 66
[3]	Žutić I, Fabian J, Das Sarma S 2004 Rev. Mod. Phys. 76 323
[4]	Awschalom D D, Flatt M E 2007 Nat. Phys. 3 153
[5]	Tian Y F, Hu S J, Yan S S, Mei L M 2013 Chin. Phys. B. 22 088505
[6]	Zhang L G 1998 Progress in Physics 3 4 (in Chinese)[张立纲1998 物理学进展3 4]
[7]	Dietl T, Ollno H, Matsukura F, Cibert J, Ferrand D 2000Science 287 1019]
[8]	Furdyna J K 1988 J. Appl. Phys. 64 R29
[9]	Ohno H, Munekata H, Penney T, Molnr S, Chang L L 1992 Phys. Rev. Lett. 68 2664
[10]	Ohno H, Shen A, Matsukura F, Oiwa A, Endo A, Katsumoto S, Iye Y 1996 Appl. Phys. Lett. 69 363
[11]	Glen G L, Dodd C G 1968 J. Appl. Phys. 39 5372
[12]	Wu Z Y, Ouvrard G, Gressier P, Natoli C R 1997 Phys. Rev. B 55 10382
[13]	Zhao L, Lu P F, Yu Z Y, Ma S J, Ding L, Liu J T 2012 Chin. Phys. B 21 097103
[14]	Verdoes D, Zandbergen H W, Ijdo D J W 1987 Mater. Res. Bull. 22 1
[15]	Foo M L, Huang Q, Lynn J W, Lee W J, Klimczuk T, Hagemann I S, Ong N P, Cava R J 2006 J. Solid State Chem. 179 563
[16]	Shlyk L, Ueland B G, Lynn J W, Huang Q, De Long L E, Parkin S 2010 Phys. Rev. B 81 184415
[17]	Zhu P P 2010 Ms. D. Dissertation (Shenyang:Dongbei university) (in Chinese) [朱盼盼 2010 硕士学位论文 (沈阳:东北大学)]
[18]	Schpp-Niewa B, Shlyk L, Kryukov S, De Long L, Niewa R 2007 Naturforsch Z. Teil B. 62 753
[19]	Shlyk L, De Long L E, Kryukov S, Schpp-Niewa B, Niewa R 2008 J. Appl. Phys. 103 07D112
[20]	Shlyk L, Kryukov S, Schpp-Niewa B, Niewa R, De Long L E 2008 Adv. Mater. 20 1315
[21]	Obradors X, Collomb A, Pannetier J 1983 Mater. Res. Bull. 18 1543
[22]	Shlyk L, Parkin S, De Long L E 2010 J. Appl. Phys. 107 09E109
[23]	Yu T 2009 Ph. D. Dissertation (Tianjin:Tianjin university) (in Chinese) [于涛 2009 博士学位论文 (天津:天津大学)]
[24]	Prokes S M, Gole J L, Chen X 2006 Adv. Funct. Mater. 15 161
[25]	Prokes S M, Carlos W E, Gole J L 2003 Materials Research Society 738 239

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