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Elementary excitations in single-chain magnets

Lutz, Philipp and Aguila, David and Mondal, Abhishake and Pinkowicz, Dawid and Marx, Raphael and Neugebauer, Petr and Fak, Bjorn and Ollivier, Jacques and Clerac, Rodolphe and van Slageren, Joris (2017) Elementary excitations in single-chain magnets. In: PHYSICAL REVIEW B, 96 (9).

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Official URL: http://doi.org/10.1103/PhysRevB.96.094415

Abstract

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.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 07 Oct 2017 06:07
Last Modified: 07 Oct 2017 06:07
URI: http://eprints.iisc.ac.in/id/eprint/57973

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