Large-field versus discontinuous instantons in spin orientation tunneling

Details Large-field versus discontinuous instantons in spin orientation tunneling Large-field versus discontinuous instantons in spin orientation tunneling

2002-10-11

arxiv.org/abs/cond-mat/0210277v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex4, 9 pages, 1 embedded figure

Scientific paper

Tunnel splitting oscillations in magnetic molecules are reconsidered within the simplest model for the problem, which does not contain fourth order anisotropy. It is shown that at large magnetic field, there is only one instanton, and it is continuous. This is in contrast to the discontinuous instantons that are induced by the fourth order term [Ersin Ke\c{c}ecio\u{g}lu and A. Garg, Phys. Rev. Lett. {\bf 88}, 237205 (2002)].

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