Physicists listened to electrical noise to crack a superconductor mystery
Summary
Physicists used electrical shot noise to investigate the pseudogap, a state in copper-based superconductors where measurements detect fewer electrons than expected. The study team used a scanning tunneling microscope to measure current fluctuations at selected energies, aiming to test whether electrons form pairs before the material becomes superconducting.Key Facts
- Cuprate superconductors can work at temperatures reachable with liquid nitrogen, but scientists still debate how their high-temperature superconductivity works.
- The pseudogap appears above the temperature at which cuprates become superconducting, and measurements show fewer electrons at certain energies.
- One explanation says electrons freeze into patterns; another says they form pairs before superconductivity begins.
- The researchers measured shot noise, small current fluctuations caused by individual charges arriving.
- The team used a scanning tunneling microscope to measure noise at different energies and locations on a cuprate sample.
- The study examined BSCCO crystals cooled to a few degrees above absolute zero.
- The article text provided does not include the study’s results or its conclusion.
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