What is the superconducting mechanism of graphene intercalation materials?

A study by the US Department of Energy's National Linear Accelerator Laboratory (SLAC) and Stanford University revealed for the first time the superconducting mechanism of graphene intercalation composites and found a potential process that would make graphene a promising application. The king of materials "obtains the superconducting properties that people have always dreamed of. This research will help promote the application of graphene in superconductivity and develop high-speed transistors, nano-sensors and quantum computing devices. Related papers were published in the March 20 issue of Nature News.

Graphene is a single-layer carbon atom structure arranged in a honeycomb shape. It is the thinnest and strongest material known at present and has excellent physical and chemical properties. Scientists hope to use graphene to make high-speed transistors, sensors and even transparent electrodes. Previously, it has been known that graphene intercalation materials doped with metal atoms have two-dimensional superconducting properties. But scientists have been unable to determine whether superconductivity is derived from metals, graphene, or both. For the first time, the new study proves that graphene plays a key role through convincing evidence. It paved the way for the application of related materials in the field of nanoscale electronic devices.

The physicist's organization network reported on March 21 that the researchers came to the conclusion by studying the material called calcium intercalated graphene (CaC6) by strong ultraviolet light. CaC6 is a graphene intercalation composite obtained by chemical reaction between pure calcium crystal and graphite. It is composed of a single layer of carbon atom graphene and a single layer of atomic calcium.

The researchers analyzed a sample of CaC6 from University College London (UCL) at the Stanford Synchrotron Radiation Source Laboratory (SSRL). High-intensity UV light helps them penetrate deep into the material to see how the electrons in each layer move. Experiments have shown that electrons scatter back and forth between the graphene and calcium atom layers, and naturally oscillate and pair with the atomic structure of the material, thereby obtaining electrical resistance without resistance.

Yang Shuolong, a graduate student at the Stanford Materials and Energy Science Institute (SIMES) who led the research, said: "Our work has opened up a way for graphene to achieve superconductivity. This is a long-term dream of the scientific community that has not been realized. The goal of the superconducting mechanism of graphene intercalation materials was first revealed by means of synchrotron radiation sources."

He said that although the application of superconducting graphene is difficult to achieve in the short term, its potential application value is limitless, and many devices including ultra-high frequency analog transistors, nanosensors and electronic devices, and quantum computers are expected. Become reality.

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