Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
Phys Rev Lett. 2011 Jun 3;106(22):227201. doi: 10.1103/PhysRevLett.106.227201. Epub 2011 May 31.
A Mn(4) single-molecule magnet displays asymmetric Berry-phase interference patterns in the transverse-field (H(T)) dependence of the magnetization tunneling probability when a longitudinal field (H(L)) is present, contrary to symmetric patterns observed for H(L)=0. Reversal of H(L) results in a reflection of the transverse-field asymmetry about H(T)=0, as expected on the basis of the time-reversal invariance of the spin-orbit Hamiltonian which is responsible for the tunneling oscillations. A fascinating motion of Berry-phase minima within the transverse-field magnitude-direction phase space results from a competition between noncollinear magnetoanisotropy tensors at the two distinct Mn sites.
当存在纵向场 (H(L)) 时，Mn(4)单分子磁体在磁化隧道概率的横向场 (H(T)) 依赖性中显示出非对称的Berry 位相干涉模式，而当 H(L)=0 时观察到对称的模式。当反转 H(L)时，横向场的不对称性关于 H(T)=0 发生反射，这基于负责隧道振荡的自旋轨道哈密顿量的时间反演不变性是可以预期的。Berry 位相最小值在横向场大小-方向相空间中的迷人运动源自两个不同 Mn 位点的非共线磁各向异性张量之间的竞争。
