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:12/17/2014)... 2014 Valencell, a leader in performance biometric ... to industry leaders such as Intel, Jabra, Atlas, and ... wearable products. These products will be showcased at CES ... Vegas . "Our partners choose ... robust – with the clinical data to back it ...
(Date:12/11/2014)... --Research and Markets , ... ) has announced the addition of the ... to their offering. One major ... technology. With continuous advances in technology, it is ... standard that meets the needs and expectations of ...
(Date:12/10/2014)... 8, 2014 You,ve been here before: you desperately ... remember your password, site key or the answer to your ... grade teacher? Today, Hoyos Labs , ... that will finally put an end to the frustration that ... . 1U leverages a user,s smartphone to acquire his ...
Breaking Biology News(10 mins):Valencell PerformTek Biometrics Power the Most Accurate Wearables at CES 2015 2Biometrics Market in the APAC Region 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 3
... skin. Cancer is not a static disease but during ... defences adapting to new environmental circumstances, protecting against chemotherapy ... Until now little was known about the mechanisms ... is a particularly intriguing way in which a tumour ...
... of carbon in the world,s oceans, which cover 70 ... climate cycles, with many questions remaining unanswered. Between 200 ... "twilight zone" where insufficient sunlight penetrates for microorganisms to ... resident at these depths capture carbon dioxide that they ...
... of spring-run Chinook salmon in California by the end ... at UC Davis, the Stockholm Environment Institute and the ... for managing water resources to protect the salmon runs, ... Thompson, director of the Center for Aquatic Biology and ...
Cached Biology News:Why cancer cells change their appearance? 2Up from the depths: How bacteria capture carbon in the 'twilight zone' 2Warming streams could be the end for salmon 2
(Date:12/24/2014)... Boston, MA (PRWEB) December 23, 2014 ... presentation, Dr. James L. Sherley, director of the Adult ... attention on an often overlooked and under appreciated unique ... “Asymmetric Self-Renewal by Distributed Stem Cells: Misunderstood in the ... his message to congress participants. He gave the ...
(Date:12/24/2014)... MD (PRWEB) December 23, 2014 ... into law H.R. 83, the Omnibus and Continuing ... first time, made hydrocephalus a condition eligible to ... Programs (CDMRP) administered by the Department of Defense ... with its allies on Capitol Hill, is celebrating ...
(Date:12/24/2014)... Dallas, Texas (PRWEB) December 23, 2014 ... on methyl mercaptan such as its definition, ... also presents product specification, manufacturing process, and ... regions, technology and applications. The analysis also ... survey, marketing channels, industry development trend and ...
(Date:12/24/2014)... The report expects global cell isolation and ... also provides a carefully analyzed data about the vital ... market. , Full Copy of Report @ http://bit.ly/1yUxy0T ... for cell expansion will keep witnessing growth at an ... to be driven by rapid technological advancements, government funding ...
Breaking Biology Technology:Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 2Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 3Adult Stem Cell Technology Center, LLC’s Director Sherley's Address on What’s Holding Back Regenerative Medicine Featured on Omics Group Website 4Rare Brain Condition Now Eligible for Department of Defense Research Dollars 2Worldwide Methyl Mercaptan Market 2015-2020 Forecasts on Development & Trends Now Available at ReportsnReports.com 2The Cell Expansion Market is Expected to Reach $14.8 billion by 2019 - New Research Report by MarketsandMarkets 2The Cell Expansion Market is Expected to Reach $14.8 billion by 2019 - New Research Report by MarketsandMarkets 3
... Physical Laboratory (NPL) is working to provide more reliable measurement ... which could lead to much more accurate devices in the ... in 1986. It uses a nano-sized probe to feel the ... Braille on an extremely small scale. The technique can also ...
... SEATTLE, Oct. 20 Adaptive TCR Technologies, a ... the release of its immunoSEQ™ profiling service and ... provide researchers and clinicians the ability to profile ... level of detail that has never before been ...
... ACCESS PHARMACEUTICALS, INC. (OTC Bulletin ... its proprietary drug-delivery platforms to develop treatments in areas ... has submitted additional patent applications, covering its Cobalamin-mediated oral ... drugs, as a result of the growing interest surrounding ...
Cached Biology Technology:Measuring the electrical properties of nano-crystals 2Adaptive TCR Launches the immunoSEQ™ Product Line - Visualizing the Immune System With Next-Generation Sequencing. 2Adaptive TCR Launches the immunoSEQ™ Product Line - Visualizing the Immune System With Next-Generation Sequencing. 3Access Pharmaceuticals Files Additional IP For Cobalamin Oral Delivery Technology 2Access Pharmaceuticals Files Additional IP For Cobalamin Oral Delivery Technology 3
... Fixed clamp trays and universal trays ... Magnetic drive Shaking speed: ... 25 mm amplitude Clamps ... 2000 ml, including Fernbach flasks ...
... convenient, and efficient Denatured protein concentration following ... spin column to make handling easy. The ... which were electro-eluted in their Denatured condition. ... high binding capacity fo all pH values. ...
In Western blotting antibodies recognize 94 K protein band, which corresponds to S-layer protein...
High affinity antibodies recognizes HSP70 protein from human cardiac tissue. Could be used for Westerb blotting application, ELISA....
Biology Products: