麻豆传媒

News — A new imaging technology is giving scientists unprecedented views of the processes that affect the flow of electrons through materials.

By modifying a familiar tool in nanoscience 鈥� the Scanning Tunneling Microscope 鈥� a team at Cornell University鈥檚 Laboratory for Atomic and Solid State Physics have been able to visualize what happens when they change the electronic structure of a 鈥渉eavy fermion鈥� compound made of uranium, ruthenium and silicon. What they found sheds light on superconductivity 鈥� the movement of electrons without resistance 鈥� which typically occurs at extremely low temperatures and that researchers hope one day to achieve at something close to room temperature, which would revolutionize electronics. What they found was that, while at higher-temperatures magnetism is detrimental to superconductivity, at low temperatures in heavy fermion materials, magnetic atoms are a necessity. 鈥淲e found that removing the magnetic atoms proved detrimental to the flow [of electrons],鈥� said researcher Mohammad Hamidian. This is important, Hamidian explains, because 鈥渋f we can resolve how superconductivity can co-exist with magnetism, then we have a whole new understanding of superconductivity, which could be applied toward creating high-temperature superconductors. In fact, magnetism at the atomic scale could become a new tuning parameter of how you can change the behavior of new superconducting materials that we make.鈥� To make things finding, the researchers modified a scanning microscope that lets you pull or push electrons into a material. With the modification, the microscope could also measure how hard it was to push and pull 鈥� a development that Hamidian explains is also significant. 鈥淏y doing this, we actually learn a lot about the material鈥檚 electronic structure. Then by mapping that structure out over a wide area, we can start seeing variations in those electronic states, which come about for quantum-mechanical reasons. Our newest advance, crucial to this paper, was the ability to see at each atom the strength of the interactions that make the electrons 鈥榟eavy.'鈥� The Cornell experiment and its results are presented this week by the Proceedings of the National Academy of Sciences (See PNAS, available online at www.pnas.org). The research team included J.C. S茅amus Davis, a member of the Kavli Institute at Cornell for Nanoscale Science and developer of the SI-STM technique. Working with synthesized samples created by Graeme Luke from McMaster University (Canada), the experiment was designed by Hamidian, a post-doctoral fellow in Davis鈥� research group, along with Andrew R. Schmidt, a former student of Davis at Cornell and now a post-doctoral fellow in physics at UC Berkeley. For the complete interview with Hamidian, visit: