Magnetic and structural properties of Ni-substituted magnetoelectric Co4Nb2O9

The magnetic and structural properties of polycrystalline Co4−xNixNb2O9 (x=1,2) have been investigated by neutron powder diffraction, magnetization and heat capacity measurements, and density functional theory (DFT) calculations. For x=1, the compound crystallizes in the trigonal P3¯c1 space group....

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Bibliographic Details
Published in:Physical review. B 2019-10, Vol.100 (13)
Main Authors: Papi, Hadi, Favre, Virgile Yves, Ahmadvand, Hossein, Alaei, Mojtaba, Khondabi, Mohammad, Sheptyakov, Denis, Keller, Lukas, Kameli, Parviz, Živković, Ivica, Rønnow, Henrik M
Format: Article
Language:English
Subjects:
Antiferromagnetism
Configurations
Crystal structure
Density functional theory
Ferrimagnetism
Magnetic anisotropy
Magnetic moments
Magnetic properties
Magnetic structure
Mathematical analysis
Neutron diffraction
Neutrons
Nickel
Specific heat
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Summary:The magnetic and structural properties of polycrystalline Co4−xNixNb2O9 (x=1,2) have been investigated by neutron powder diffraction, magnetization and heat capacity measurements, and density functional theory (DFT) calculations. For x=1, the compound crystallizes in the trigonal P3¯c1 space group. Below TN=31 K it develops a weakly noncollinear antiferromagnetic structure with magnetic moments in the ab plane. The compound with x=2 has crystal structure of the orthorhombic Pbcn space group and shows a hard ferrimagnetic behavior below TC=47 K. For this compound a weakly noncollinear ferrimagnetic structure with two possible configurations in the ab plane was derived from neutron diffraction study. By calculating magnetic anisotropy energy via DFT, the ground-state magnetic configuration was determined for this compound. The heat capacity study in magnetic fields up to 140 kOe provides further information on the magnetic structure of the compounds.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.134408