亚铁磁Heusler合金Mn2CoGa和Mn2CoAl掺杂Cr, Fe和Co的局域铁磁结构

张玉洁; 李贵江; 刘恩克; 陈京兰; 王文洪; 吴光恒; 胡俊雄

doi:10.7498/aps.62.037501

摘要

通过实验和计算的方法研究了Mn2CoMxGa1-x 和Mn2CoMxAl1-x (M=Cr, Fe, Co)掺杂系列合金样品. 研究发现, 在共价作用的影响下, Fe和Co原子占A位, 使被取代的MnA (-2.1 B)变成MnD (3.2 B), 在最近邻的强交换作用下亚铁磁基体中形成了MnB-CoC-MnD局域铁磁性结构, 使分子磁矩的增量最高可达6.18 B. Fe, Co 掺杂后建立同样的局域铁磁结构, 居里温度的变化趋势却不同. 实验观察到Mn2Co1+xAl1-x中掺杂容忍度高达x=0.64, 远高于在Mn2CoGa中(x=0.36)的结果; 以及随着Al的减少, 合金由B2有序向A2混乱转变等现象, 为共价作用对合金结构稳定的影响提供了证据. 磁测量中发现Cr掺杂后磁矩增量高达3.65 B以及居里温度快速上升的反常现象, 意味着对占位规则的违背.

关键词:

Abstract

The crystal structures and magnetic properties of Mn2CoMxGa1-x and Mn2CoMxAl1-x (M=Cr, Fe, Co) alloys are investigated through experiment and calculation. Due to the covalent effect, the doped Fe and Co atoms preferentially occupy the A sites. It causes that some MnA (-2.1 B) atoms become MnD (3.2 B) and a local ferromagnetic structure of MnB-CoC-MnD is generated in the ferrimagnetic matrix, showing that an increment of molecular moment is as high as 6.18 B. The achievement of the ferromagnetic structure consumes the exchange interaction energy, consequently, reducing the TC in Fe doping alloys. It is found that the toleration for doping Co in Mn2CoAl reaches up to x=0.64, much more than that in Mn2CoGa (x=0.36), and the change from ordered B2 to A2 structures along with the decrease of Al content. These observations reveal the importance of the covalent effect in these intermetallic compounds. The Cr doping shows an abnormal increment of molecular moment of 3.65 B and increases the TC rapidly, which implies that Cr atoms may take an atomic configuration thereby disobeying to the occupation rule.

Keywords:

作者及机构信息

1.
中国科学院物理研究所, 磁学国家重点实验室, 北京 100190;

2.
四川师范大学物理与电子工程学院, 成都 610068

基金项目: 国家自然科学基金 (批准号: 51031004, 11174352)资助的课题.

Authors and contacts

1.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

2.
College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 51031004, 11174352).

参考文献

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[17]	Feng Z Q, Luo H Z, Wang Y X, Li Y X, Zhu W, Wu G H, Meng F B 2010 Phys. Status Solidi A 207 1481
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[19]	Sabine W, Maria C M A, Jonder M, Vadim K, Sergio R T, Giovanna M, Gerhard H F, Claudia F 2007 Journal of Physics D: Applied Physics 40 1524
[20]	Liu G D, Dai X F, Yu S Y, Zhu Z Y, Chen J L, Wu G H, Zhu H, Xiao J Q 2006 Phys. Rev. B 74 054435
[21]	Ziebeck K R A, Webster P J 1974 J. Phys. Chem. Solids 35 1
[22]	W P J 1971 J. Phys. Chem. Solids 32 1221
[23]	Galanakis I, Dederichs P H, Papanikolaou N 2002 Phys. Rev. B 66 174429
[24]	Luo H, Zhu Z, Liu G, Xu S, Wu G, Liu H, Qu J, Li Y 2008 Physica B: Condensed Matter 403 200
[25]	Hongzhiet L 2008 J. Phys. D: Appl. Phys. 41 055010
[26]	Küler J, William A R, Sommers C B 1983 Phys. Rev. B 28 1745
[27]	Zhu W, Liu E K, Zhang C Z, Qin Y B, Luo H Z, Wang W H 2012 Acta Phys. Sin. 61 027502 (in Chinese) [朱伟, 刘恩克, 张常在, 秦元斌, 罗鸿志, 王文洪 2012 物理学报 61 027502]

施引文献

[1]	Kainuma R, Imano Y, Ito W, Sutou Y, Morito H, Okamoto S, Kitakami O, Oikawa K, Fujita A, Kanomata T, Ishida K 2006 Nature 439 957
[2]	Kainuma R, Imano Y, Ito W, Morito H, Sutou Y, Oikawa K, Fujita A, Ishida K, Okamoto S, Kitakami O, Kanomata T 2006 Appl. Phys. Lett. 88 192513
[3]	Yu S Y, Ma L, Liu G D, Liu Z H, Chen J L, Cao Z X, Wu G H, Zhang B, Zhang X X 2007 Appl. Phys. Lett. 90 242501
[4]	Planes A, Mañsa L, Moya X, Krenke T, Acet E M, Wassermann F 2007 J. Magnetism and Magnetic Materials 310 2767
[5]	Offernes L, Ravindran P, Kjekshus A 2007 J. Alloys and Compounds 439 37
[6]	de Groot R A, Mueller F M, Engen P G V, Buschow K H J 1983 Phys. Rev. Lett. 50 2024
[7]	Zhao J J, Qi X, Liu E K, Zhu W, Qian J F, Li G J, Wang W H, Wu G H 2001 Acta Phys. Sin. 60 047108 (in Chinese) [赵晶晶, 祁欣, 刘恩克, 朱伟, 钱金凤, 李贵江, 王文洪, 吴光恒 2011 物理学报 60 047108]
[8]	Liu G D, Dai X F, Liu H Y, Chen J L, Li Y X, Xiao G, Wu G H 2008 Phys. Rev. B 77 014424
[9]	Ma L, Wang W H, Zhen C M, Hou D L, Tang X D, Liu E K, Wu G H 2011 Phys. Rev. B 84 224404
[10]	Katayama H, Terakura K, Kanamori J 1979 Solid State Commun. 29 431
[11]	Akai H 1992 Hyperfine Interactions 68 3
[12]	Webster P J 1969 Contemporary Physics 10 559
[13]	Le Dang K, Veillet P, Campbell I A 1978 J. Phys. F: Metal Physics 8 1811
[14]	Burch T J, Litrenta T 1974 Phys. Rev. Lett. 33 421
[15]	Graf T, Casper F, Winterlik J, Balke B, Fecher G H, Felser C 2009 Zeitschrift Für Anorganische Und Allgemeine Chemie 635 976
[16]	Liu Z H, Liu H, Zhang X X, Zhang M, Dai X F, Hu H N, Chen J L, Wu G H 2004 Phys. Lett. A 329 214
[17]	Feng Z Q, Luo H Z, Wang Y X, Li Y X, Zhu W, Wu G H, Meng F B 2010 Phys. Status Solidi A 207 1481
[18]	Burch T J, Budnick J I, Niculescu V A, Raj K, Litrenta T 1981 Phys. Rev. B 24 3866
[19]	Sabine W, Maria C M A, Jonder M, Vadim K, Sergio R T, Giovanna M, Gerhard H F, Claudia F 2007 Journal of Physics D: Applied Physics 40 1524
[20]	Liu G D, Dai X F, Yu S Y, Zhu Z Y, Chen J L, Wu G H, Zhu H, Xiao J Q 2006 Phys. Rev. B 74 054435
[21]	Ziebeck K R A, Webster P J 1974 J. Phys. Chem. Solids 35 1
[22]	W P J 1971 J. Phys. Chem. Solids 32 1221
[23]	Galanakis I, Dederichs P H, Papanikolaou N 2002 Phys. Rev. B 66 174429
[24]	Luo H, Zhu Z, Liu G, Xu S, Wu G, Liu H, Qu J, Li Y 2008 Physica B: Condensed Matter 403 200
[25]	Hongzhiet L 2008 J. Phys. D: Appl. Phys. 41 055010
[26]	Küler J, William A R, Sommers C B 1983 Phys. Rev. B 28 1745
[27]	Zhu W, Liu E K, Zhang C Z, Qin Y B, Luo H Z, Wang W H 2012 Acta Phys. Sin. 61 027502 (in Chinese) [朱伟, 刘恩克, 张常在, 秦元斌, 罗鸿志, 王文洪 2012 物理学报 61 027502]

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