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Magnetic ground state of perovskite structure quantum paraelectric EuTiO3 has been known to have a planar anisotropic G-type antiferromagnet structure according to the experimental study. In this paper, based on density functional theory, first-principles computations are performed to investigate the magnetic properties and spin-exchange interaction of EuTiO3 in both of the quantum paraelectric phase and ferroelectric tetragonal phase under stress. By analyzing the energies of different magnetic structures and paths of spin exchange coupling as well as the effect of stress on the magnetic exchange paths change, it is found that when the system of EuTiO3 is free, it has a G-type antiferromagnetic structure with uniaxial anisotropic spin along [110] direction. Furthermore, in this structure, Eu 4f electron spin achieves antiferromagnetic super-exchange coupling via O 2p state at face-centered position. However, in the ferroelectric tetragonal phase structure induced by applied stress field, Eu 4f electron spin achieves ferromagnetic exchange coupling in [110] direction due to the variation of Eu-O-Eu bond angle in spin exchange path.
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Keywords:
- magnetic /
- spin ordering /
- super-exchange interaction /
- magnetoelectric effects
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[1] Ramesh R, Spaldin N A 2007 Nat. Mater. 6 21
[2] [3] Wang K F, Liu J M, Ren Z F 2009 Adv. Phys. 58 321
[4] Ma J, Hu J M, Li Z, Nan C W 2011 Adv. Mater. 23 1062
[5] [6] Zhong C G, Chen Q, Dong Z C, Fang J H 2011 J. Nantong Univ. (Nat. Sci. Ed.) 10 58
[7] [8] [9] Yao C D, Geng F F, Gao H, Xu Y L, Zhang A M, Tang C M, Zhu W H, Gong J F 2010 Acta Phys. Sin. 59 5332 (in Chinese) [姚长达, 耿芳芳, 高虹, 徐云玲, 张爱梅, 唐春梅, 朱卫华, 巩江峰 2010 物理学报 59 5332]
[10] Zhu H W, Jiang P, Wang S L, Tang W H, Mao L F 2010 Acta Phys. Sin. 59 5710 (in Chinese) [朱晖文, 姜平, 王顺利, 唐为华, 毛凌峰 2010 物理学报 59 5710]
[11] [12] [13] Zhong C G, Jiang Q, Fang J H, Jiang X F, Luo L J 2009 Acta Phys. Sin. 58 7227 (in Chinese) [仲崇贵, 蒋青, 方靖淮, 江学范, 罗礼进 2009 物理学报 58 7227]
[14] Katsufuji T, Takagi H 2001 Phys. Rev. B 64 054415
[15] [16] Jiang Q, Wu H 2003 J. Appl. Phys. 93 2121
[17] [18] Jiang Q, Wu H 2002 Chin. Phys. 11 1303
[19] [20] [21] Shvartsman V V, Borisov P, Kleemann W, Kamba S, Katsufuji T 2010 Phys. Rev. B 81 064426
[22] Kamba S, Nuzhnyy D, Vanek P, Savinov M, Knize K, Shen Z, Santava E, Maca K, Sadowski M, Petzelt J 2007 Europhys. Lett. 80 27002
[23] [24] Kugimiya K, Fujita K, Tanaka K, Hirao K 2007 J. Magn.Magn. Mater. 310 2268
[25] [26] Sushkov A O, Eckel S, Lamoreaux S K 2010 Phys. Rev. A 81 022104
[27] [28] [29] Rushchanskii K Z, Kamba S, Goian V, Vanek P, Savinov M, Prokleska J, Nuzhnyy D, Kn\izek K, Laufek F, Eckel S, Lamoreaux S K, Sushkov A O, Lezaic M, Spaldin N A 2010 Nat. Mater. 9 649
[30] [31] McGuire T R, Shafer M W, Joenk R J, Alperin H A, Pickart S J 1966 J. Appl. Phys. 31 981
[32] Lee J H, Fang L, Vlahos E, Ke X, Jung Y W, Kourkoutis L F, Kim J W, Ryan P J, Heeg T, Roeckrath M, Goian V, Bernhagen M, Uecker R, Hammel P C, Rabe K M, Kamba S, Schubert J, Freeland J W, Muller D A, Fennie C J, Schiffer P, Gopalan V, Johnston-Halperin E, Schiom D G 2010 Nature 466 954
[33] [34] [35] Fennie C J, Rabe K M 2006 Phys. Rev. Lett. 97 267602
[36] [37] Zhou W L, Xia K, Xu D, Zhong C G, Dong Z C, Fang J H 2012 Acta Phys. Sin. 61 097702 (in Chinese) [周文亮, 夏坤, 许达, 仲崇贵, 董正超, 方靖淮 2012 物理学报 61 097702]
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[40] [41] Scagnoli V, Allieta M, Walker H, Scavini M, Katsufuji T, Sagarna L, Zaharko O, Mazzoli C 2012 Phys. Rev. B 86 094432
[42] [43] Ravindran P, Kjekshus A, Fjellvg H, Delin A Eriksson 2002 Phys. Rev. B 65 06445
[44] Snden R, Ravindran P, Stonlen S, Grande T M 2006 Phys. Rev. B 74 144102
[45] [46] Blochl P E 1994 Phys. Rev. B 50 17953
[47] [48] Kresse G, Joubert D 1999 Phys. Rev. B 59 1758
[49] [50] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[51] [52] Ranjan R, Nabi H S, Pentcheva R 2007 J. Phys.: Condens. Matter 19 406217
[53] [54] Petrović A P, Kato Y, Sunku S S, Ito T, Sengupta P, Spalek L, Shimuta M, Katsufuji T, Batista C D, Saxena S S, Panagopoulos C 2013 Phys. Rev. B 87 064103
[55] [56] [57] Chen C L, De Benedetti S, Barros F, De S 1974 Phys. Rev. B 10 3913
[58] Akamatsu H, Kumagai Y, Oba F, Fujita K, Murakami H, Tanaka K, Tanaka I 2011 Phys. Rev. B 83 214421
[59] [60] [61] Wu T, Cao H 2012 J. Soochow Univ. (Nat. Sci. Ed.) 28 75
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