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Magnetic and structural properties of Ni-substituted magnetoelectric Co4Nb2O9

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Papi Hadi, Favre Virgile Yves, Ahmadvand Hossein, Alaei Mojtaba, Khondabi Mohammad, Sheptyakov Denis, Keller Lukas, Kameli Parviz, Zivkovic Ivica, Ronnow Henrik M.,
Project Quantum Magnetism - Checkerboards, Skyrmions and Dipoles
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Original article (peer-reviewed)

Volume (Issue) 100(13)
Page(s) 134408
Title of proceedings PHYSICAL REVIEW B
DOI 10.1103/physrevb.100.134408

Open Access

Type of Open Access Repository (Green Open Access)


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 P (3) over bar c1 space group. Below T-N = 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 T-C = 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.