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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.
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Keywords:
- hesuler alloy /
- atomic order /
- ferromagnetic structure /
- exchange interaction energy
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[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
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[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
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[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 61 027502]
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[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 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 61 027502]
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