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

这个美国-捷克材料研究项目涉及密歇根大学的Ctirad Uher和他的捷克合作伙伴，Pardubice大学的Petr Lostak，将建立在他们最近报告的一类基于碲化锑[Sb 2 Te 3]的各向异性半导体中的长程铁磁性的观察基础上，掺杂微量的钒。 他们现在计划研究过渡金属离子在Sb 2 Te 3单晶晶格中的作用，目标是确定将居里温度提高到钒掺杂值（~ 25 K）以上的掺杂剂。 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集团在四亚甲基石型结构半导体的传输和磁性方面的专业知识，以及捷克合作伙伴在单晶生长和这些材料表征方面的优势。 稀磁半导体在这一领域的成果可能会导致在信息技术中的应用，因为薄膜中的电荷载流子传输和自旋操纵具有很好的双重特性。 这个凝聚态物理学的合作项目实现了促进科学知识的计划目标，使美国和中欧的专家能够联合收割机互补人才，并在共同感兴趣和能力强的领域共享研究资源。

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.