New Physics Law Unifies Several Superconducting Compounds
Date: Thursday, August 05, 2004 @ 22:55:43 GMT
Topic: Science

From Brookhaven National Laboratory:
UPTON, NY -- A research group led by a scientist at the U.S. Department of Energy's Brookhaven National Laboratory has discovered a simple relationship that mathematically links the properties of a class of high-temperature superconductors, materials that, below a certain temperature, conduct electricity with no resistance. This new, unexpected law applies to superconductors with very different structures and compositions, and may provide clues to understanding the mechanism of high-temperature superconductivity. It is discussed in the July 29, 2004 issue of Nature...

Homes focused on several members of a class of high-temperature superconductors known as cuprates, which are characterized by layers of copper oxide. He found a relationship between three of each cuprate's physical properties: direct current, or dc, conductivity (how much direct current it conducts); critical temperature (the temperature below which it superconducts); and the "superfluid density" in the superconducting state. This last property refers to how many current carriers -- electrons or "holes" (which are spaces in the electron sea that act positively charged) -- are in the superconductor...

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