Navigation Links
Zeroing in on quantum effects
Date:5/28/2010

y without the bumping and heating.

That explanation sufficed until 1986, when physicists discovered new materials that became superconductors at temperatures above 100 kelvins. These "high-temperature superconductors" were made of layers of copper alloys sandwiched between layers of nonconducting material that were laced, or "doped," with trace amounts of material that could contribute a few extra electrons to the mix.

Physicists quickly realized their existing theories of superconductivity could not explain what was happening in the new materials. For one thing, the undoped versions of the compounds didn't conduct electricity at all. Their electrons -- due to their desire to repel one another -- tended to lock themselves a comfortable distance away from their neighbors. This locked pattern was dubbed "Mott localization," which gives rise to an insulating state.

In 2008, the search for answers took another turn when a second class of high-temperature superconductors was discovered. Dubbed the pnictides, these new iron-based superconductors were also layered and also needed to be doped. But unlike their copper cousins, undoped pnictides were not Mott insulators.

"Mott localization doesn't occur in the undoped pnictides, but there is considerable evidence that the electrons in these materials are near the point where Mott localization occurs," Si said. "This proximity to Mott localization endows the system with strong quantum magnetic fluctuations, which we believe underlie the high-temperature superconductivity in the pnictides."

In all high-temperature superconductors, the iron or copper atoms in the conducting layers form a grid-like, checkerboard pattern.

In work published earlier this year, Si and colleagues replaced arsenic atoms in one of the intervening layers of a pnictide with slightly smaller phosphorous atoms. This subtle change brought the iron atoms in the checkerboard a tad closer together, and that
'/>"/>

Contact: Jade Boyd
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Untangling the quantum entanglement behind photosynthesis
2. Digging deep into diamonds, applied physicists advance quantum science and technology
3. Scientists find quantum mechanics at work in photosynthesis
4. Diamonds may be the ultimate MRI probe, say Quantum physicists
5. Covering the bases: Quantum effect may hold promise for low-cost DNA sequencing, sensor applications
6. Rice eyes risks of quantum dots
7. New technique is quantum leap forward in understanding proteins
8. Strained quantum dots show new optical properties
9. Study shows quantum dots can penetrate skin through minor abrasions
10. Europe gets together to harness quantum physics
11. A gentle touch for better control, a quantum mechanical con, and milestone PRL papers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... hippocampus, the marginal division of the striatum is ... the impact degree of substance P in the ... Yan Yu and his team, College of Biophotonics, ... staining, that substance P receptor, neurokinin 1 was ... division of normal rats. Unilateral or bilateral injection ...
(Date:7/11/2014)... In the brains of all vertebrates, information is ... electric or chemical signal to be passed from ... are the most abundant type of synapse, can ... crucial for learning, memory, perception and cognition, and ... for brain function. For instance, every time ...
(Date:7/10/2014)... , July 1, 2014 Smart technology ... for convenience and improved security: NXT-ID, Inc. (OTCBB: NXTD), eBay ... GOOG ), Apple Inc. (NASDAQ: AAPL ), ... (NYSE: MA) NXT-ID, Inc., (OTCQB: NXTD) a biometric authentication ... announce that the second series of 30 second spots on ...
Breaking Biology News(10 mins):Blame it on the astrocytes 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 4Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 5
... the genetic cause of an inherited condition that causes ... at the University of Leeds, together with colleagues from ... should allow couples at risk of conceiving babies with ... identified beforehand through genetic screening. Their findings, which ...
... Scientists have discovered a way of mimicking ... the wings of tropical butterflies. The findings could ... helping to make bank notes and credit cards ... displayed on beetles, butterflies and other insects have ...
... WASHINGTON, May 29, 2010 Scientists have ... made from sticky rice, the delicious "sweet rice" that ... concluded that the mortar ― a paste used to ... other construction materials ― remains the best available material ...
Cached Biology News:Researchers find gene linked to birth defects 2From butterflies' wings to bank notes -- how nature's colors could cut bank fraud 2Revealing the ancient Chinese secret of sticky rice mortar 2
(Date:7/10/2014)... 2014 On July 9 Prime ... presented Russia,s first national "Industry" ... Company is developing a unique project called MabNext ... a number of innovative drugs based on monoclonal antibodies ... took place at the International Exhibition "Innoprom 2014" in ...
(Date:7/10/2014)... -- Research and Markets ( http://www.researchandmarkets.com/research/s3bqj2/photonic ) has ... Integrated Circuit (Monolithic Integration, Hybrid Integration, Module Integration) ... their offering. http://photos.prnewswire.com/prnh/20130307/600769 ... traces its roots in the latter half of ... went unexplored and unfulfilled for several decades owing ...
(Date:7/10/2014)... help in the fight against terrorism with the creation ... explosives with the use of light and special glass ... Actuators B: Chemical , the researchers describe a novel ... as low as 6.3 ppm (parts per million). It ... , "Traditionally explosives detection has involved looking for metals ...
(Date:7/10/2014)... Understanding the basis of psychiatric disorders has been extremely ... increase risk but are insufficient to cause disease. Now ... Cell Press journal Cell Stem Cell describe ... genetic risks interact with other risk factors or environmental ... Their research pinpoints a genetic variant that may predispose ...
Breaking Biology Technology:Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2International Photonic Integrated Circuit (Monolithic Integration, Hybrid Integration, Module Integration) Market - Forecasts to 2019 2Detecting trace amounts of explosives with light 2New strategy could uncover genes at the root of psychiatric illnesses 2
... BETHESDA, Md., April 24, 2012 Northwest Biotherapeutics, Inc. (OTC ... IZI Institute in announcing that, working closely together over the ... significant milestones in NW Bio,s DCVax®-L program for brain cancer ... move forward in the near term in Germany with both ...
... April 23, 2012  Melanie Pita, J.D., will offer ... journey for rural hospitals as she presents "EHRs: ... Health Association,s Annual Conference, being held  April 24-26, ... Effingham, Ill.   During the presentation, ...
... evolution and complexity of terrestrial organisms, including human beings, because ... organisms, which in turn were able to generate more energy. ... work inside the body, more attention is being paid to ... them. A number of environmental factors -- ...
Cached Biology Technology:Northwest Bio and Fraunhofer IZI Announce Milestones Reached 2Northwest Bio and Fraunhofer IZI Announce Milestones Reached 3Northwest Bio and Fraunhofer IZI Announce Milestones Reached 4Prognosis HIS Executive Slated To Offer EHR Advice At Illinois Rural Health Association Conference 2Avocado Oil: The 'Olive Oil Of The Americas'? 2Avocado Oil: The 'Olive Oil Of The Americas'? 3Avocado Oil: The 'Olive Oil Of The Americas'? 4