Incommensurate magnetic structure and its long-time variation in a geometrically frustrated magnet Ca3Co2O6

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  • Incommensurate magnetic structure and its long time variation in a geometrically frustrated magnet Ca3Co2O6

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Magnetization and neutron scattering measurements have been performed on a single crystal of the magnetically frustrated compound Ca 3 Co 2 O 6 . This compound has no random magnetic interactions, but has frustrating magnetic interactions arising from its crystal structure. In this material, a long-time variation in magnetic structure has been observed. After cooling the sample below the transition temperature T c2 =13 K, the magnetic Bragg peaks at (1, 0, ±δ) corresponding to an incommensurate antiferromagnetic structure move toward (1, 0, 0) with time. The characteristic time for this variation follows the Arrhenius law with an activation energy E a / k B ∼53 K. A new magnetic structure model of this material is also presented.

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