Chen Xi, Fu Ying-Shuang, Ji Shuai-Hua, Zhang Tong, Cheng Peng, Ma Xu-Cun, Zou Xiao-Long, Duan Wen-Hui, Jia Jin-Feng, Xue Qi-Kun
Department of Physics, Tsinghua University, Beijing 100084, China.
Phys Rev Lett. 2008 Nov 7;101(19):197208. doi: 10.1103/PhysRevLett.101.197208.
The superexchange mechanism in cobalt phthalocyanine (CoPc) thin films was studied by a low temperature scanning tunneling microscope. The CoPc molecules were found to form one-dimensional antiferromagnetic chains in the film. Collective spin excitations in individual molecular chains were measured with spin-flip associated inelastic electron tunneling spectroscopy. By spatially mapping the spin-flipping channels with submolecular precision, we are able to explicitly identify the specific molecular orbitals that mediate the superexchange interaction between molecules.
利用低温扫描隧道显微镜研究了钴酞菁（CoPc）薄膜中的超交换机制。发现CoPc分子在薄膜中形成一维反铁磁链。用与自旋翻转相关的非弹性电子隧穿光谱测量了单个分子链中的集体自旋激发。通过以亚分子精度对自旋翻转通道进行空间映射，我们能够明确识别介导分子间超交换相互作用的特定分子轨道。
