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

The spin dynamics of the molecular magnetic chain [Dy(hfac){sub 3}(NIT(C{sub 6}H{sub 4}OPh))] were investigated by means of the Muon Spin Relaxation (μ{sup +}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){sub 3}(NIT(C{sub 6}H{sub 4}OPh))] have been studied by measuring the magnetization vs. temperature at different applied magnetic fields (H = 5, 3500, and 16500 Oe) and by performing μ{sup +}SR experiments vs. temperature in zero field and in a longitudinal applied magnetic field H = 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 λ{sub interm}(T), associated with the intermediate relaxing component. The experimental λ{sub interm}(T) data were fitted with a corrected phenomenological Bloembergen-Purcell-Pound law by using a distribution of thermally activated correlation times, which average to τ = τ{sub 0} exp(Δ/k{sub B}T), corresponding to a distribution of energy barriers Δ. The correlation times can be associated with the spin freezing that occurs when the system condenses in the ground state.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [7]
  1. Department of Physics, Università degli Studi di Milano, and INSTM, Milano (Italy)
  2. Department of Physics, Università degli Studi di Pavia and INSTM, Pavia (Italy)
  3. Department of Physics and Astronomy, Università degli Studi di Bologna, Bologna (Italy)
  4. Physikalisches Institut, Universität Stuttgart, Stuttgart (Germany)
  5. INSTM and Department of Chemistry, University of Florence, Firenze (Italy)
  6. Departamento de Quimica Inorganica, Universidad del Pais Vasco, Bilbao (Spain)
  7. (Italy)
Publication Date:
OSTI Identifier:
22409950
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; CORRELATIONS; DIFFUSION BARRIERS; DYSPROSIUM COMPOUNDS; FREEZING; GROUND STATES; MAGNETIC FIELDS; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MAGNETIZATION; MAGNETS; MUON SPIN RELAXATION; SPIN; TEMPERATURE DEPENDENCE