Magnetism and Superconductivity
Researchers find magnetic link to high-temperature superconductivity
Researchers from the Stanford Institute for Materials and Energy Science, a joint SLAC-Stanford institute, have seen strong indications of a relationship between the superconductive and magnetic properties of high-temperature superconductors — a relationship long suspected but difficult to investigate experimentally. Any step toward a real understanding of high temperature superconductors is a big step right now. Today’s superconductors need extreme cold to keep conducting electricity with 100 percent efficiency, but extreme cold is not cheap. If current research leads to room temperature superconductors, superconducting technologies such as loss-less power lines and levitating high-speed trains will be economically as well as technically feasible.
A paper in last week’s Physical Review Letters explains how the researchers, led by Kathryn Moler, attacked the mystery by employing a new technique to investigate a suspected connection between magnetism and superconductivity in high-temperature superconductors called iron pnictides. The researchers “doped” the pnictide crystals (in this case barium iron arsenide) with varying amounts of cobalt, replacing some of the iron. Then they subjected the crystals to miniscule magnetic probes to see how they would react. They took readings mere microns apart across the face of each crystal.
“This gave us information about how many superconducting electrons were actually in a superconducting state,” explained SIMES researcher Lan Luan, first author on the paper, who recently defended her doctoral thesis based on this research. Previous experiments had been able to capture data only across the bulk of a material, Luan explained, but the “spot measurements” her team took gave a more detailed look into the electronic and superconductive behavior of the pnictide.
In my own little mind, I can see some great possibilities here. Perhaps, I knew way of propulsion. We’ll see.
Read more at Tim’s Scared Stiff
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