A new class of ferromagnetic semiconductor: Copper molybdate organic-inorganic compound with phenanthroline organic linkers

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:508

Article

Islah-U-din^1,4  Chong, Shen, V^2,3  Jameson, Geoffrey B.^2,4  Raymond, Sebastiampillai G.⁵  Lee, Geunsik⁶  Park, In K.⁶  Wang, Xiaolin⁷  Waterland, Mark R.^2,4  Tallon, Jeffery L.^2,3 

[1] Govt Coll Univ Lahore, Dept Phys, Lahore 54000, Pakistan

[2] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Wellington 6140, New Zealand

[3] Victoria Univ Wellington, Robinson Res Inst, Lower Hutt 5010, New Zealand

[4] Massey Univ, Sch Fundamental Sci, Palmerston North 4442, New Zealand

[5] Callaghan Innovat, Adv Mat Grp, Lower Hutt 5010, New Zealand

[6] Ulsan Natl Inst Sci & Technol, Dept Chem, Ulsan 44919, South Korea

[7] Univ Wollongong, Inst Superconducting & Elect Mat, Australian Inst Innovat Mat, Spintron & Elect Mat Grp, Wollongong, NSW 2500, Australia

关键词: Magnetic properties;    Layered compounds;    Organic-inorganic hybrids;    Doping;    Polycyclic aromatic hydrocarbons;   

DOI  :  10.1016/j.jmmm.2020.166881

来源: Elsevier

【 摘 要 】

A three-dimensional (3D) framework of covalently-bonded layers of bimetallic inorganic oxide, CuMoO4, interlinked by electron-rich organic ligands, which is semiconducting and also ferromagnetic, has been prepared. The structure [Cu(3,8-phenanthroline)(0.5)MoO4] consists of molybdate tetrahedra corner-shared with clusters of edge-sharing {CuO5N} octahedra. The injection of charge carriers into the inorganic layers by phenanthroline induces different magnetic orderings at different temperatures, orderings which are not found in the structurallysimilar [Cu(4,4'-bipyridine)(0.5)MoO4]. The temperature dependence of the susceptibility shows two low temperature magnetic transitions: weakly ferromagnetic-coupled spins below 15 K coexisting with an anti-ferromagnetic structure below 10 K. Specific heat capacity shows a finite ground-state electronic specific heat coefficient, gamma = 0.094 J/mol.K-2, that is higher than that of the bipyridine counterpart (0.068 J/mol.K-2), confirming an increase in the electronic density-of-states in the phenanthroline system.

【 授权许可】

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