Jamneala T, Madhavan V, Crommie M F
Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA.
Phys Rev Lett. 2001 Dec 17;87(25):256804. doi: 10.1103/PhysRevLett.87.256804. Epub 2001 Nov 30.
The triangular Cr trimer (Cr(3)) is a fundamental component in a number of frustrated, antiferromagnetic systems. We have used atomic manipulation and scanning tunneling spectroscopy to probe the local behavior of this basic magnetic substructure by fabricating and analyzing individual Cr trimers at the surface of gold. We find that Cr trimers can be reversibly switched between two distinct electronic states. This phenomenon can be explained as the Kondo response of a spin-switching, magnetically frustrated nanocluster. Such behavior is consistent with noncollinear magnetic states predicted for Cr trimers whose structures differ by the position of a single atom.
三角形铬三聚体（Cr(3)）是许多受挫反铁磁系统中的基本组成部分。我们通过在金表面制备和分析单个铬三聚体，利用原子操纵和扫描隧道光谱来探测这种基本磁子结构的局部行为。我们发现铬三聚体可以在两种不同的电子态之间可逆切换。这种现象可以解释为自旋切换、磁受挫纳米团簇的近藤响应。这种行为与预测的结构因单个原子位置不同而不同的铬三聚体的非共线磁态一致。
