Mn–Mn couplings in Mn-doped CdS nanocrystals studied by magnetic circular dichroism spectroscopy

作者：Seiji Taguchi, Atsushi Ishizumi, Takeshi Tayagaki, Yoshihiko Kanemitsu · 发表于：Applied Physics Letters · 年份：2009 · DOI：10.1063/1.3125433 · 被引用次数：45 · 研究领域：Quantum Dots Synthesis And Properties、Chalcogenide Semiconductor Thin Films、Nanocluster Synthesis and Applications

We report on the optical and magnetic properties of Mn-doped CdS nanocrystals coated with a ZnS shell layer (CdS:Mn/ZnS core-shell nanocrystals) by magnetic circular dichroism (MCD) spectroscopy. The magnetic field and temperature dependences of the MCD spectrum show paramagnetic behavior of the CdS:Mn/ZnS core-shell nanocrystals. The MCD intensity increases with the Mn concentration up to a few mol %, and then starts to decrease rapidly. This Mn-concentration dependence of the MCD intensity can be explained by the formation of Mn–Mn pairs in heavily doped nanocrystals.