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According to recent news from the physicist organization network, a recent study by the Cornell University College of Arts and Sciences has shown that strontium ruthenate may be a new type of g-wave superconductor. The relevant results were published in the latest issue of "Nature Physics".
In a superconductor, two electrons gather together to form a Cooper pair and move together. This "pairing" gives the superconductor a unique characteristic-zero resistance. In lead, tin, mercury and other s-wave superconductors, the electrons forming Cooper pairs have one spin up and one spin down, and their opposite spin values ​​are considered to balance or cancel each other, so there is no angular momentum. In the d-wave superconductor, the Cooper pair has double quantum angular momentum. At present, physicists have theoretically proved that there is a third type of superconductor between these two so-called "single state" states: a p-wave superconductor with a single quantum angular momentum, and the electron pairing method is parallel spin rather than reverse. Parallel spin.
For more than 20 years, one of the main candidates for p-wave superconductors has been strontium ruthenate. So the Cornell University research team set out to determine whether strontium ruthenate is a very ideal p-wave superconductor. By using high-resolution resonant ultrasound spectra, they found that this material may be a brand new superconductor: g-wave superconductor.
The research team measured how the elastic constant of the crystal reacts to various acoustic waves when the material is cooled in a superconducting transformation of 1.4 degrees Kelvin (minus 457.87 degrees Fahrenheit). Based on these data, they determined that strontium ruthenate is a so-called two-component superconductor, which means that the way electrons are combined is very complicated and cannot be described by a single number.
"This is the highest-precision resonant ultrasonic spectrum data obtained under low temperature conditions so far." The researchers said.
The study uses nuclear magnetic resonance spectroscopy to narrow down the possibility of clarifying which wave superconductor strontium ruthenate may be, effectively eliminating the possibility of p-wave and strontium ruthenate as a traditional s-wave or d-wave superconductor. (Intern reporter Zhang Jiaxin and intern Zhao Xuan)
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