Abstract
The magnetic properties of Ca 3Co 2O 6 have been studied by magnetic susceptibility and neutron diffraction methods from 5 K to room temperature. Magnetic ordering occurs below 24±2K. Above 80 K, the Curie-Weiss law is followed and an effective magnetic moment of 5.7±0.2 μ B was found. The magnetic structure of Ca 3Co 2O 6 has been refined from Rietveld analysis of powder neutron diffraction data at 10 K. The one-dimensional chains in Ca 3Co 2O 6 were found to have alternating low magnetic moment (0.08±0.04 μ B) for the octahedral cobalt and high magnetic moment (3.00±0.05 μ B) for the trigonal prismatic cobalt ions. Magnetic moments close to zero were indicated in the ab-plane. Ca 3Co 2O 6 is ferrimagnetic at low temperatures, with ferromagnetic ordering dominating within the CoO chains. In high magnetic fields, above around 2.7 MA m −1, a field-induced transition from ferrimagnetic to ferromagnetic structure occurs, implying turning of the spins in one chain.
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