Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Abstract

Articles you may be interested inLocal spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A l 1 spin relaxation study The spin dynamics of the molecular magnetic chain [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] were investigated by means of the Muon Spin Relaxation (l þ SR) technique. This system consists of a magnetic lattice of alternating Dy(III) ions and radical spins, and exhibits single-chain-magnet behavior. The magnetic properties of [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] have been studied by measuring the magnetization vs. temperature at different applied magnetic fields (H ¼ 5, 3500, and 16500 Oe) and by performing l þ SR experiments vs. temperature in zero field and in a longitudinal applied magnetic field H ¼ 3500 Oe. The muon asymmetry P(t) was fitted by the sum of three components, two stretched-exponential decays with fast and intermediate relaxation times, and a third slow exponential decay. The temperature dependence of the spin dynamics has been determined by analyzing the muon longitudinal relaxation rate k interm (T), associated with the intermediate relaxing component. The experimental k interm (T) data were fitted with a corrected phenomenological BloembergenPurcell-Pound law by using a distribution of thermally activated correlation times, which average to s ¼ s 0 exp(D/k B T), corresponding to a distribution of energy barriers D. The correlation times can be associated with the spin freezing that occurs when the system condenses in the ground state. V C 2015 AIP Publishing LLC. [http://dx

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