Friday, July 29, 2011

Physicists report progress in understanding high-temperature superconductors

Physicists report progress in understanding high-temperature superconductors: Shastry's theory provides a new technique to calculate from first principles the mathematical functions related to the behavior of electrons in a high-temperature superconductor...

The experimental data come from ARPES studies using two different sources of light: high-energy light from synchrotron sources and lower-energy laser sources. In studies of high-temperature superconductors, these two light sources yield significantly different photoemission spectra for the same samples, and researchers have been unable to resolve this inconsistency. But Gweon and Shastry found that these apparently irreconcilable results can be accounted for by the same theoretical functions, with a simple change in one parameter.
"We can fit both laser and synchrotron data with absolute precision, which suggests that the two techniques are consistent with each other," Shastry said. "They are telling two different slices of the same physical result."

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