Unique electron transport via individual molecules with magnetic anisotropy

Recently, single-molecule transistors based on single-molecule magnets have been
experimentally realized and various interesting features unique to single-molecule
magnets have been observed, such as nuclear spin resonance manipulated by
electric field, giant magnetoresistance or spin filtering, and current-induced
spin switching. In these studies, magnetic anisotropy induced by spin-orbit
coupling and Jahn-Teller distortion plays a crucial role. For some anisotropic
magnetic molecules, the magnetic ansiotropy can be modified from easy axis to
easy plane upon varying the oxidation state. Here we discuss how such a change
in the magnetic anisotropy can induce a new type of spin blockade in electron
transport via an Eu2(C8H8)3 molecule. In addition, we will show unique negative
differential conductance features in electron transport via a Ni9Te6(PEt3)8
molecular cluster with cubic magnetic anisotropy. For both results, we solve
the master equation based on model Hamiltonian with parameters obtained from
density-functional theory.