Mn-Mn couplings in Mn-doped CdS nanocrystals studied by magnetic circular dichroism spectroscopy
Mn-Mn couplings in Mn-doped CdS nanocrystals studied by magnetic circular dichroism spectroscopy
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DOI：
10.1063/1.3125433
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发表时间：
2009-04
影响因子：
4
通讯作者：
S. Taguchi;A. Ishizumi;T. Tayagaki;Y. Kanemitsu
中科院分区：
文献类型：
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作者：
S. Taguchi;A. Ishizumi;T. Tayagaki;Y. Kanemitsu
我们通过磁圆二色性 (MCD) 光谱报告了涂有 ZnS 壳层的 Mn 掺杂 CdS 纳米晶体（CdS:Mn/ZnS 核壳纳米晶体）的光学和磁性能。 MCD 谱的磁场和温度依赖性显示了 CdS:Mn/ZnS 核壳纳米晶体的顺磁行为。 MCD 强度随着 Mn 浓度增加到几个 mol% 而增加，然后开始迅速下降。 MCD 强度的这种 Mn 浓度依赖性可以通过重掺杂纳米晶体中 Mn-Mn 对的形成来解释。
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.