Non-Kramers Freezing and Unfreezing of Tunneling in the Biaxial Spin Model

Details Non-Kramers Freezing and Unfreezing of Tunneling in the Biaxial Spin Model Non-Kramers Freezing and Unfreezing of Tunneling in the Biaxial Spin Model

1999-02-16

arxiv.org/abs/cond-mat/9902218v3

Europhys. Lett. 50 (3), pp. 395--401 (2000)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, minor changes, published in EPL

Scientific paper

10.1209/epl/i2000-00282-0

The ground state tunnel splitting for the biaxial spin model in the magnetic field, H = -D S_{x}^2 + E S_{z}^2 - g \mu_B S_z H_z, has been investigated using an instanton approach. We find a new type of spin instanton and a new quantum interference phenomenon associated with it: at a certain field, H_2 = 2SE^{1/2}(D+E)^{1/2}/(g \mu_B), the dependence of the tunneling splitting on the field switches from oscillations to a monotonic growth. The predictions of the theory can be tested in Fe_8 molecular nanomagnets.

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