New Understanding For Superconductivity At High Temperatures
2008 01 13

From: sciencedaily.com



Visions of the future - Superconductivity & Invisibility

An international research team has discovered that a magnetic field can interact with the electrons in a superconductor in ways never before observed. Andrea D. Bianchi, the lead researcher from the Université de Montréal, explains in the January 11 edition of the journal Science what he discovered in an exceptional compound of metals -- a combination of cobalt, indium and a rare earth -- that loses its resistance when cooled to just a couple of degrees above absolute zero.

Superconductivity is a phenomenon which occurs in certain materials and which manifests itself by a complete loss of electrical resistance. An important area in the study of superconductors is how they respond to magnetic fields. Besides their obvious relevance to practical applications, such studies are an ideal way to obtain a deeper understanding of the fundamental aspects of superconductivity.

When subjected to a magnetic field, most superconductors will generate vortices (electric tornadoes) which confine them in tubes of magnetic flux. Such vortices have been described by a model for which Alexei Abrikosov and Vitaly Ginsburg received a Nobel Prize in 2003. However, the results obtained by Eskildsen and his colleagues reveal a radical departure from the usual behavior.

“Even in materials such as the high-temperature or heavy-fermion superconductors, where we do not presently understand the microscopic nature of the superconducting state, the Abrikosov-Ginzburg-Landau picture has, for more than 50 years, provided us with a phenomenological description of the vortices,” Eskildsen said. “But in CeCoIn5, as our measurements demonstrate, this paradigm breaks down, forcing us to rethink our understanding of superconductivity.”

The discovery of superconductivity in certain ceramic materials at temperatures as high as 140K (-208 degrees Fahrenheit), well above the boiling point of liquid nitrogen, opened up new possibilities for applications. Superconductors are currently being used or developed for a wide range of applications including electric power transmission, ship propulsion motors, magnetically levitated trains, magnets for medical imaging, and digital filters for high-speed communications.

Japanese Maglev, 581km/h

"This discovery sharpens our understanding of what, literally, holds the world together and brings physicists one step closer to getting a grip on superconductivity at high temperatures. Until now, physicists were going around in circles, so this discovery will help to drive new understanding," said Prof. Bianchi, who was recruited to UdeM as a Canada Research Chair in Novel Materials for Spintronics last fall and performed his experiments at the Paul Scherrer Institute in Switzerland, in collaboration with scientists from ETH Zurich, the University of Notre Dame, the University of Birmingham, U.K., the Los Alamos National Laboratory and the Brookhaven National Laboratory.

Magnetic tornado that grows stronger
Using the Swiss Spallation Neutron Source (SINQ), Prof. Bianchi and his team cooled a single-crystal sample of CeCoIn5 down to 50mK above absolute zero and applied a magnetic field nearly high enough to entirely suppress superconductivity. They found that the core of the vortices feature electronic spins that are partly aligned with the magnetic field.

This is the first experimental evidence that a theory that describes the properties of superconducting vortices and, for which Abrikosov and Ginzburg received the Nobel Prize in 2003, which does not generally apply in magnetically-induced superconductors.

"When subjected to intense magnetic fields, these materials produce a completely new type of magnetic tornado that grows stronger with increasing fields rather than weakening," said Prof. Bianchi. "The beauty of this compound is how we can experiment without breaking it."

Superconductors hold great promise for technological applications that will change how modern civilization can store and transmit energy - arguably some of the most pressing challenges today. Other notable applications include superconducting digital filters for high-speed communications, more efficient and reliable generators and motors, and superconducting device applications in medical magnetic resonance imaging machines.

The first superconductor was discovered nearly a hundred years ago, and in most materials this curious state with no resistance was shown to arise from the interaction of the electrons with the crystal; however, in this new material, superconductivity is thought to arise from magnetic interactions between electrons.

Article from: http://www.sciencedaily.com/releases/2008/01/080111110510.htm

Demo of small-scale Superconductivity



Related Articles
Superconductivity
Meissner effect
New Form of Matter Discovered, Part Laser, Part Superconductor
Worlds Largest Superconducting Magnet Switches On
Physicists have 'solved' mystery of levitation
Invisibility cloaks are in sight
Demonstration and the mathematics of invisibility cloaking (Video)
Now you see it, now you don't: cloaking device is not just sci-fi
Magnetic energy? Perhaps
The OC's Magnetic Perpetual Motion Machine


Latest News from our Front Page

Climate March in New York City Reveals Communists Demanding ’Revolution, Nothing Less’ - Trash the City With Garbage
2014 09 22
Tens-of-thousands of demonstrators took to the streets of New York City Sunday to demand political leaders take action on climate change. While the protest remained peaceful, much of the “People’s Climate March” appeared to be made up of fringe elements of the political left. Dozens of signs denouncing capitalism were spotted at the demonstration, often held by self-proclaimed socialists. “Capitalism is destroying the ...
Google 2.0 Will Build Cities And Airports
2014 09 22
The world’s got problems and the Google CEO is searching for solutions. As if self-driving cars, balloon-carried internet, or the eradication of death weren’t ambitious enough projects, Google CEO Larry Page has apparently been working behind the scenes to set up even bolder tasks for his company. The Information reports that Page started up a Google 2.0 project inside the company ...
Why is the US - Mexico Border left open?
2014 09 22
Zach Taylor Interview from the film; "Back to the Border" JFA Retired Border Patrolman of 27 years gives exclusive interview to Chris Burgard for the film, "Back to the Border." Some scary stuff about human trafficking, guns, drugs and how governments are involved. This guy should know. Source: youtube.com A look at Mexico’s Immigration Laws - Who Knew?
The Georgia Guidestones Have Officially Been Updated with the Year 2014
2014 09 22
The elite’s cryptic monument to depopulation and world government just became more mysterious (and creepier) – somebody has officially updated it with an engraved cube marking the year 2014 inserted into the English/Spanish slab of the ’new 10 commandments’ for the ’Age of Reason’ desired by its creators. Read the rest: TRUTHstreammedia
VOTER FRAUD: Was the Scottish Independence Referendum Rigged to Fail?
2014 09 20
Was voter fraud committed during the Scottish Independence referendum? It has been confirmed that the names of 10 people were already crossed off a voter list prior them voting inside a polling station. According to reports, the Glasgow City Council confirmed that there were ten cases of suspected electoral fraud occurring at polling stations following the Scottish referendum vote on the 18th. ...
More News »