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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2017

Elementary excitations in single-chain magnets

Résumé

Single-chain magnets (SCMs) are one-dimensional coordination polymers or spin chains that display slow relaxation of the magnetization. Typically their static magnetic properties are described by the Heisenberg model, while the description of their dynamic magnetic properties is based on an Ising-like model. The types of excitations predicted by these models (collective vs localized) are quite different. Therefore we probed the nature of the elementary excitations for two SCMs abbreviated Mn2Ni and Mn2Fe, as well as a mononuclear derivative of the Mn2Fe chain, by means of high-frequency electron paramagnetic resonance spectroscopy (HFEPR) and inelastic neutron scattering (INS). We find that the HFEPR spectra of the chains are clearly distinct from those of the monomer. The momentum transfer dependence of the INS intensity did not reveal significant dispersion, indicating an essentially localized nature of the excitations. At the lowest temperatures these are modified by the occurrence of short-range correlations.

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Matériaux
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Dates et versions

hal-01599303 , version 1 (02-10-2017)

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Philipp Lutz, David Aguilà, Abhishake Mondal, Dawid Pinkowicz, Raphael Marx, et al.. Elementary excitations in single-chain magnets. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 96 (094415), ⟨10.1103/PhysRevB.96.094415⟩. ⟨hal-01599303⟩

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