Ferromagnetism below 10 k in Mn-doped BiTe

Jan-Willem G Bos, M Lee, E Morosan, H W Zandbergen, W L Lee, N P Ong, R J Cava

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Abstract

Ferromagnetism is observed below 10 K in [Bi0.75Te0.125Mn0.125]Te. This material has the BiTe structure, which is made from the stacking of two Te-Bi-Te-Bi-Te blocks and one Bi-Bi block per unit cell. Crystal structure analysis shows that Mn is localized in the Bi-2 blocks, and is accompanied by an equal amount of Te-Bi antisite occupancy in the Bi2Te3 blocks. These Te-Bi antisite defects greatly enhance the Mn solubility. This is demonstrated by comparison of the [Bi1-xMnx]Te and [Bi1-2xTexMnx]Te series; in the former, the solubility is limited to x=0.067, while the latter has x(max)=0.125. The magnetism in [Bi1-xMnx]Te changes little with x, while that for [Bi1-2xTexMnx]Te shows a clear variation, leading to ferromagnetism for x>0.067. Magnetic hysteresis and the anomalous Hall effect are observed for the ferromagnetic samples.

Original languageEnglish
Article number184429
Number of pages7
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume74
Issue number18
DOIs
Publication statusPublished - 1 Nov 2006

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