2001/08/31 by Marco Ameduri, Richard A. Klemm · 1 citation
Biochemistry, Genetics and Molecular Biology · Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Electron Spin Resonance Studies #Magnetism in coordination complexes #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.66.224404
published as Phys. Rev. B 66, 224404 (2002). · 9 pages, 14 figures, accepted for publication in Phys. Rev. B
arxiv created 2002/10/04 · openalex publication_date 2002/12/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
At an arbitrary temperature T, we solve for the dynamics of single molecule magnets composed of three classical Heisenberg spins either on a chain with two equal exchange constants J1, or on an isosceles triangle with a third, different exchange constant J2. As \stackrel\ensuremath→T\ensuremath∞, the Fourier transforms and long-time asymptotic behaviors of the two-spin time correlation functions are evaluated exactly. The lack of translational symmetry on a chain or an isosceles triangle yields time correlation functions that differ strikingly from those on an equilateral triangle with J1=J2. At low T, the Fourier transforms of the two autocorrelation functions with J1\ensuremath≠J2 show one and four modes, respectively. For a semi-infinite J2/J1 range, one mode is a central peak. At the origin of this range, this mode has an interesting scaling form.