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News from the March 2008 American Physical Society Meeting
Date:3/13/2008

or producing materials with unique properties that exist at the nanoscale, such as enhanced magnetism and improved catalytic activity. Brookhaven scientist Oleg Gang will present this research on Wednesday, March 12, at 4:30 p.m. Central Time in room 210.

This new assembly method relies on the attractive forces between complementary strands of DNA, but the scientists also heated the DNA-linked particles, then cooled them back to room temperature. "This 'thermal processing' allows the nanoparticles to unbind, reshuffle, and find more stable binding arrangements," Gang said.

A patent application has been filed for the technology.


Closing the "Pseudogap" on Superconductivity
Embargoed for release on Monday, March 10, 2008, 12:51 p.m. Central Time (1:18 p.m. Eastern)

One of the biggest mysteries in studying high-temperature (Tc) superconductors - materials that conduct electrical current with no resistance below a certain transition temperature - is the origin of a gap in the energy level of the materials' electronic spectrum. Brookhaven physicist Hongbo Yang will present his latest research on this "pseudogap" on Monday, March 10, 2008, at 12:51 p.m. Central Time in room RO8.

Understanding the pseudogap may help scientists understand the mechanism for high-temperature superconductivity, which in turn could lead to the strategic design of superconductors for practical applications such as high-capacity, highly efficient power transmission lines.

There are competing theories for the origin of the pseudogap. In one, the material is considered a normal metal from which superconductivity starts to emerge via the pairing of electrons. In another, the pseudogap is thought to reflect the competition between superconductivity and another condition of the material - some other "ground state."

"Our new results indicate that the first theory is clearly incorrect, these are not normal metals that s
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Contact: Karen McNulty Walsh
kmcnulty@bnl.gov
631-344-8350
DOE/Brookhaven National Laboratory
Source:Eurekalert

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