Comment on "Hole digging in ensembles of tunneling molecular magnets"

Details Comment on "Hole digging in ensembles of tunneling molecular magnets" Comment on "Hole digging in ensembles of tunneling molecular magnets"

2004-06-25

arxiv.org/abs/cond-mat/0406641v2

Phys. Rev. B v72, p026401 (2005)

Physics

Condensed Matter

Other Condensed Matter

3 LaTeX pages, 4 eps figures. Additional text and figures. Submitted to PRB on 4 October 2004. Accepted on 4 November 2004

Scientific paper

10.1103/PhysRevB.72.026401

Tupitsyn et al. [Phys. Rev. B v69, 132406 (2004)] have recently reported results for the relaxation of crystalline systems of single--molecule magnets, such as Fe_8. They claim that, quite generally, (1) the magnetization and hole widths of field--distributions evolve with time t as sqrt{t}, and (2) the holes' line shapes are Lorentzian. We give a counter--example to these conclusions, and show that the main assumption on which they rest is invalid.

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