Magnetic frustration in partially ordered double perovskites Ln3Ni2RuO9 (Ln = La, Nd)

JOURNAL OF ALLOYS AND COMPOUNDS

卷:806

Article

Laha, S.¹  Gopalakrishnan, J.¹  Natarajan, S.¹  Romero de Paz, J.²  Solana-Madruga, E.³  Dos Santos-Garcia, A. J.⁴  Garcia-Martin, S.³  Fabelo, O.⁵  Moran-Miguelez, E.³  Saez-Puche, R.³ 

[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

[2] Univ Complutense Madrid, Fac Ciencias Fis, CAI Tecn Fis, Avda Complutense S-N, Madrid, Spain

[3] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan, E-28040 Madrid, Spain

[4] Univ Politecn Madrid, Dept Ingn Quim & Diseno Ind, C Ronda Valencia 3, Madrid 28012, Spain

[5] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France

关键词: Oxide materials;    Double perovskite;    Solid state metathesis;    Powder neutron diffraction;    Spin-glass behavior;   

DOI  :  10.1016/j.jallcom.2019.07.354

来源: Elsevier

【 摘 要 】

Ln(3)Ni(2)RuO(9) (Ln = La, Nd) oxides (prepared by a solid state metathesis route) adopt a monoclinic (P2(1)/n) A(2)BB'O-6 double perovskite structure wherein the two independent octahedral 2c and 2d sites are occupied by Ni2+ and (Ni1/32+Ru2/35+) cations, respectively. In contrast to the expected ferromagnetic behavior, Ln(3)Ni(2)RuO(9) oxides show a spin-glass behavior without long range magnetic order down to 2 K. These results reveal the importance of competing nearest neighbor (NN), next nearest neighbor (NNN) and third nearest neighbor (third NN) interactions between the magnetic Ni2+ and Ru5+ ions in the partially ordered double perovskite structure that conspire to thwart the expected ferromagnetic order in these materials. (C) 2019 Elsevier B.V. All rights reserved.

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