Using New Technique, Scientists Uncover a Delicate Magnetic Balance for Superconductivity

Engineerblogger
Oct 20, 2011

Left: A view from below of the experimental probe, with the vacuum can removed. The STM head can be seen in white at the bottom while the rest of the device is effectively a refrigerator used to push the temperature down close to absolute zero. Right: The sealed probe, which includes the STM head and other refrigeration. It is iced over in the picture because this is just as we have removed it from a bath of Liquid helium (at 4Kelvin). Courtesy: M. Hamidian

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 – the Scanning Tunneling Microscope – a team at Cornell University’s Laboratory for Atomic and Solid State Physics have been able to visualize what happens when they change the electronic structure of a “heavy fermion” compound made of uranium, ruthenium and silicon. What they found sheds light on superconductivity – the movement of electrons without resistance –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. “We found that removing the magnetic atoms proved detrimental to the flow [of electrons],” said researcher Mohammad Hamidian. This is important, Hamidian explains, because “if 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.”

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 – a development that Hamidian explains is also significant. “By doing this, we actually learn a lot about the material’s 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 ‘heavy.'”


Source: The Kavli Foundation