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    High-temperature superconductor 'pseudogap' imaged
    Posted on Thursday, September 25, 2008 @ 22:46:53 MST by vlad

    Science By Bill Steele, Physics: Image: With the right combination of temperature (right scale) and percentage of doping (bottom scale), a cuprate crystal becomes superconducting (dark blue curve). As the percentage of doping decreases, a scanning tunneling microscope image reveals some electrons flowing as waves (shown in a Fourier diagram at lower left) and more and more electrons locked in place in the crystal lattice (image at upper left). This finding points the way toward higher-temperature superconductors, researchers say. Image: Davis Lab

    (PhysOrg.com) -- Cornell researchers and colleagues have produced the first atomic-scale description of what electrons are doing in the mysterious "pseudogap" in high-temperature superconductors.

    Materials known as cuprates, made of copper oxide doped with other atoms, can become superconducting with just the right amount of doping, which allows electrons to bind into pairs that can conduct electricity without interference. "Pseudogap" refers to the fact that at some levels of doping an energy signal for these "Cooper pairs" is found, yet the material does not superconduct. Now Cornell experimenters find that in this state electrons may pair up, but most of the pairs are locked into fixed locations in the crystal lattice.

    "These are the experimental observations," said J.C. Sťamus Davis, the J.G. White Distinguished Professor of Physical Sciences at Cornell and a senior scientist at Brookhaven. "Now it's up to the theorists to explain why it's this way." Davis and colleagues at the Brookhaven National Laboratory and in Japan report the work in the Aug. 28 issue of the journal Nature. ..

    More: http://www.physorg.com/news141320422.html

     
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    "High-temperature superconductor 'pseudogap' imaged" | Login/Create an Account | 6 comments | Search Discussion
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    Unlocking the secret of the Kondo Effect (Score: 1)
    by vlad on Thursday, September 25, 2008 @ 22:49:47 MST
    (User Info | Send a Message) http://www.zpenergy.com
    (PhysOrg.com) -- A team of scientists including researchers from the London Centre for Nanotechnology at UCL (University College London) and the IBM Almaden Research Center has forged a breakthrough in understanding an intriguing phenomenon in fundamental physics: the Kondo effect. The findings are reported online today in the scientific journal Nature Physics.

    Full article: http://www.physorg.com/news141290015.html [www.physorg.com]



    Electron pairs precede high-temperature superconductivity (Score: 1)
    by vlad on Saturday, November 08, 2008 @ 20:12:37 MST
    (User Info | Send a Message) http://www.zpenergy.com
    Electron pairs precede high-temperature superconductivity

    (PhysOrg.com) -- Like astronomers tweaking images to gain a more detailed glimpse of distant stars, physicists at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory have found ways to sharpen images of the energy spectra in high-temperature superconductors — materials that carry electrical current effortlessly when cooled below a certain temperature. These new imaging methods confirm that the electron pairs needed to carry current emerge above the transition temperature, before superconductivity sets in, but only in a particular direction.

    Full story: http://www.physorg.com/news145110552.html [www.physorg.com]




    Strong Magnetic Fields Could Raise Superconducting Critical Temperature (Score: 1)
    by vlad on Sunday, December 21, 2008 @ 22:11:48 MST
    (User Info | Send a Message) http://www.zpenergy.com
    A new-found aspect to superconductivity, called the "paramagnetic intrinsic Meissner effect," is that a strong magnetic field could be used to raise temperatures at which materials become superconducting.

    More: http://nextbigfuture.com/2008/12/strong-magnetic-fields-could-raise.html [nextbigfuture.com]



    The pseudogap persists as material superconducts (Score: 1)
    by vlad on Tuesday, January 27, 2009 @ 21:11:24 MST
    (User Info | Send a Message) http://www.zpenergy.com

    For nearly a century, scientists have been trying to unravel the many mysteries of superconductivity, where materials conduct electricity with zero resistance.

    Among the many questions: the existence of the pseudogap, a phase that up until now was found in materials as they were cooled to temperatures above the superconducting temperature - the phase where materials superconduct....

    More: http://www.physorg.com/news152263441.html [www.physorg.com]




    Breakthrough experiment on high-temperature superconductors (Score: 1)
    by vlad on Sunday, February 22, 2009 @ 21:51:09 MST
    (User Info | Send a Message) http://www.zpenergy.com
    December 12th, 2008 [www.physorg.com] in Physics [www.physorg.com] / Physics [www.physorg.com]
    Breakthrough experiment on high-temperature superconductors

    The highly unusual situation shown in this plot had not been predicted by any known theoretical model.

    (PhysOrg.com) -- New information about the metallic state from which high temperature superconductivity emerges, has been revealed in an innovative experiment performed at the University of Bristol.

    The international team of physicists, led by Professor Nigel Hussey from the University’s Physics Department, publish their results today in Science Express, a rapid online access service for important new publications in the journal Science.

    Superconductivity is a process by which a pair of electrons travelling in opposite directions and with opposite spin direction suddenly become attracted to one another. By pairing up, the two electrons manage to lose all their electrical resistance. This superconducting state means that current can flow without the aid of a battery.

    Historically, this remarkable state had always been considered a very low temperature phenomenon, thus the origin of the superconductivity peculiar to very unusual metallic materials termed ‘high temperature superconductors’, still remains a mystery....

    More: http://www.physorg.com/news148317352.html [www.physorg.com]




    Physicists offer new theory for iron compounds (Score: 1)
    by vlad on Sunday, March 15, 2009 @ 13:39:34 MST
    (User Info | Send a Message) http://www.zpenergy.com
    PHYSICISTS OFFER NEW THEORY FOR IRON COMPOUNDS, March 12
    An international team of physicists from the United States and China this week offered a new theory to both explain and predict the complex quantum behavior of a new class of high-temperature superconductors.

    Full story at http://www.physorg.com/news156094850.html
    [www.physorg.com]



     

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