U.S.-Czech Republic Materials Research on Novel Magnetic Semiconductors Based on Antimony Telluride [Sb2Te3]

密歇根大学的tirad Uher和他的捷克合作伙伴Pardubice大学的peter Lostak参与了这个美国-捷克材料研究项目，该项目将建立在他们最近报道的一种基于碲化锑[Sb2Te3]的各向异性半导体的远程铁磁性的观察基础上，该半导体掺杂了微量的钒。他们现在计划研究加入到Sb2Te3单晶晶格中的过渡金属离子的影响，目标是确定将居里温度提高到超过钒掺杂值（~25K）的掺杂剂。具体来说，研究人员将研究铬、锰、铁、镍和钴的作用。此次合作得益于密歇根大学在四钛矿型结构半导体的输运和磁性方面的专业知识，以及捷克大学在单晶生长和这些材料表征方面的优势。考虑到薄膜中载流子输运和自旋操纵的双重特性，稀释磁性半导体领域的研究结果可能会导致在信息技术中的应用。这个凝聚态物理合作项目实现了推进科学知识的计划目标，使美国和中欧的专家能够在共同感兴趣和能力强的领域结合互补的人才和共享研究资源。

This U.S.-Czech materials research project involving Ctirad Uher of the University of Michigan and his Czech partner, Petr Lostak at the University of Pardubice, will build upon their recently reported observation of long-range ferromagnetism in a class of ansiotropic semiconductors based on antimony telluride [Sb2Te3], doped with a minute amount of vanadium. They now plan to study the effect of transition metal ions incorporated in the crystal lattice of Sb2Te3 single crystals with the goal of identifying dopants that enhance the Curie temperature beyond the vanadium-doped value (~25K). Specifically, the researchers will examine the role of chromium, manganese, iron, nickel and cobalt. The collaborative effort benefits from the Michigan group's expertise in transport and magnetic properties of tetradymite-type structure semiconductors and the Czech partners' strengths in growth of single crystals and characterization of these materials. Results in this area of diluted magnetic semiconductors may lead to applications in information technology given the promising dual features of charge carrier transport and spin manipulation in thin films. This collaborative project in condensed matter physics fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.