ConAl (n= 18)合金团簇结构和磁性质研究

吕瑾; 秦健萍; 武海顺

doi:10.7498/aps.62.053101

摘要

采用密度泛函理论中的广义梯度近似(DFT-GGA)对ConAl (n= 18)合金团簇进行了系统的几何、电子结构和磁性质研究. 研究结果表明Al原子倾向于与Co原子形成最大的成键数, 即Al原子均处在团簇原子拥有最大配位数的位置上. Al掺杂后ConAl团簇的稳定性减弱, 磁性降低. 磁性降低的幅度与实验上对较大ConAlM团簇的磁性检测结果获得了很好地符合. 在所有ConAl团簇的最稳定结构中, 除Co4Al外, Al与近邻Co原子均呈现反铁磁性耦合. 相对于纯Co团簇,非磁性Al元素的掺入以及Al掺杂后Co原子整体自旋极化的减弱是导致ConAl团簇磁性的降低主要原因.

关键词:

Abstract

Based on DFT-GGA calculations, we systematically investigate the structures, electronic and magnetic properties of ConAl (n= 18) clusters. The results indicate that the aluminum prefers to maximize the number of Co-Al bonds by selecting the site which increases the coordination of cobalt atoms with Al. The doped Al makes the stability of ConAl clusters weakened and the magnetism decreased as compared with that of Con+1 clusters. The reduction magnitude of magnetism of the doping Al accords well with recent Stern-Gerlach experimental result for larger ConAlM clusters. In all of the ConAl alloy clusters, the Al atom is found to be aligned antiferromagnetically with its neighbor Co atoms except for Co4Al. As compared with the magnetism of pure Co cluster, the magnetism of ConAl cluster is reduced, which is attributed mainly to nor-magnetism Al element embeding and the weakening of spin polarization of the Co atoms.

Keywords:

作者及机构信息

1.
山西师范大学化学与材料科学学院, 临汾 041004

基金项目: 山西省青年科技研究基金(批准号: 2012021020-1)资助的课题.

Authors and contacts

1.
School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, China

Funds: Project supported by the Youth Science and Technology Foundation of Shanxi Province (Grant No. 2012021020-1).

参考文献

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施引文献

[1]	Alonso J A 2000 Chem. Rev. 100 637
[2]	Billas Isabelle M L, Châtelain A, de Heer Walt A 1994 Science 265 1682
[3]	Billas Isabelle M L, Châtelain A, de Heer Walt A 1997 J. Mag. Mag. Mat. 168 64
[4]	Xu X S, Yin S Y, Moro R, de Heer Walt A 2005 Phys. Rev. Lett. 95 237209
[5]	Knickelbein M B 2006 J. Chem. Phys. 125 044308
[6]	Andriotis A N, Menon M 1998 Phys. Rev. B 57 10069
[7]	Datta S, Kabir M, Ganguly S, Sanyal B, Saha-Dasgupta T, Mookerjee A 2007 Phys. Rev. B 76 014429
[8]	Dong C D, Gong X G 2008 Phys. Rev. B 78 020409
[9]	Rodríguez-López J L, Aguilera-Granja F, Michaelian K, Vega A 2003 Phys. Rev. B 67 174413
[10]	Rives S, Catherinot A, Dumas-Bouchiat F, Champeaux C, Videcoq A, Ferrando R 2008 Phys. Rev. B 77 085407
[11]	Li Z Q, Gu B L 1993 Phys. Rev. B 47 13611
[12]	Ma Q M, Xie Z, Wang J, Liu Y, Li Y C, 2006 Phys. Lett. A 358 289
[13]	Yin S Y, Moro R, Xu X S, de Heer W A 2007 Phys. Rev. Lett. 98 113401
[14]	Ren F Z, Wang Y X, Tian F Y, Zhao W J, Luo Y H 2008 Acta Phys. Sin. 57 2165 (in chinese) [任凤竹、王渊旭、田付阳、赵文杰、罗有华 2008 物理学报 57 2165]
[15]	Ge G X, Jing Q, Cao H B, Yang Z Q, Tang G H, Yan, H X 2011 Acta Phys. Sin. 60 103102 (in Chinese) [葛桂贤, 井群, 曹海滨, 杨增强, 唐光辉, 闫红霞 2011 物理学报 60 103102]
[16]	Nonose S, Sone Y, Onodera K, Sudo S, Kaya K 1990 J. Phys. Chem. 94 2744
[17]	Nakajima A, Kishi T, Sugioka T, Sone Y, Kaya K 1991 J. Phys. Chem. 65 6833
[18]	Hihara T, Pokrant S, Becker J A 1998 Chem. Phys. Lett. 294 357
[19]	Knickelbein M B 2007 Phys. Rev. B 75 014401
[20]	Yin S Y 2006 Ph. D. Dissertation (Atlanta: School of Physics Georgia Institute of Technology)
[21]	Ganguly S, Kabir M, Datta S, Sanyal B, Mookerjee A 2008 Phys. Rev. B 78 014402
[22]	Shen N F, Wang J L, Zhu L Y 2008 Chem. Phys. Lett. 467 114
[23]	Wu P, Yuan L F, Yang J L 2008 J. Phys. Chem. A 112 12320
[24]	Rollmann G, Sahoo S, Hucht A, Entel P 2008 Phys. Rev. B 78 134404
[25]	Delley B 1990 J. Chem. Phys. 92 508; 2000 113 7756
[26]	Perdew J P, Wang Y 1992 Phys. Rev. B 45 13244
[27]	Zhang Y, Duan Y N, Zhang J M, Xu K W 2011 J. Mag. Mag. Mat. 323 842
[28]	Tian F Y, Jing Q, Wang Y X 2008 Phys. Rev. A 77 013202
[29]	Zhao G F, Zhang J, Jing Q, Luo Y H, Wang Y X 2007 J. Chem. Phys. 127 234312
[30]	Kant A, Strauss B 1964 J. Chem. Phys. 41 3806
[31]	Calleja M, Rey C, Alemany M M G, Gallego L J, Ordejón P, Sánchez-Portal D, Artacho E, Soler J M 1999 Phys. Rev. B 60 2020
[32]	Rao B K, Jena P 1990 Appl. Phys. Lett. 57 2308
[33]	Deshpande M, Kanhere D G, Pandey R 2005 Phys. Rev. A 71 063202
[34]	Deshpande M D, Roy S, Kanhere D G 2007 Phys. Rev. B 76 195423
[35]	Kittel C 2005 Introduction to Solid State Physics (8th ed) (Wiley, New York) p50
[36]	Wang X, Cao Z X, Lv X, Lin M H, Zhang Q E 2005 J. Chem. Phys. 123 064315
[37]	Mazin I I 1999 Phys. Rev. Lett. 83 1427
[38]	Duan H M, Zheng Q Q 2001 Phys. Lett. A 280 333
[39]	Zhang G W, Feng Y P, Ong C K 1996 Phys. Rev. B 54 17208
[40]	Turek I, Hafner J 1992 Phys. Rev. B 46 247
[41]	Turek I, Becker C, Hafner J 1992 J. Phys.: Condens. Matter 4 7257

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