Non-Kramers freezing and unfreezing of tunneling in the biaxial spin model

被引：22

作者：

Chudnovsky, EM

Martínez-Hidalgo, X

机构：

[1] CUNY Herbert H Lehman Coll, Dept Phys & Astron, Bronx, NY 10468 USA

[2] Univ Barcelona, Dept Fis Fonamental, E-08028 Barcelona, Spain

来源：

EUROPHYSICS LETTERS | 2000年 / 50卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1209/epl/i2000-00282-0

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ground state tunnel splitting for the biaxial spin model in the magnetic field, H = -DSx2 + ESz2 - 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.

引用

页码：395 / 401

页数：7

共 22 条

[1] Superparamagnetic-like behavior in an octanuclear iron cluster [J].