Featured Research

from universities, journals, and other organizations

New parallel found between cold gases and 'hot' superconductors

Date:
July 9, 2010
Source:
National Institute of Standards and Technology (NIST)
Summary:
Scientists have discovered another notable similarity between ultracold atomic gases and high-temperature superconductors, suggesting there may be a relatively simple shared explanation for equivalent behaviors of the two very different systems.

NIST Fellow Deborah Jin in her laboratory at JILA where she studies ultracold atomic gases and their similarities to high-temperature superconductors. The atoms are initially trapped and cooled in a glass cylinder located below the copper coils.
Credit: Burrus/NIST

Scientists at JILA, working with Italian theorists, have discovered another notable similarity between ultracold atomic gases and high-temperature superconductors, suggesting there may be a relatively simple shared explanation for equivalent behaviors of the two very different systems.

Described in Nature Physics, the new research lends more support to the idea that JILA studies of superfluidity (flow with zero friction) in atomic gases may help scientists understand far more complicated high-temperature superconductors, solids with zero resistance to electrical current at relatively high temperatures. Known high-temperature superconductors only superconduct well below room temperature, but a detailed understanding of how the materials work may one day lead to practical applications such as more efficient transmission of electricity across power grids.

JILA is operated jointly by the National Institute of Standards and Technology (NIST) and the University of Colorado at Boulder.

The JILA group studies how atoms in a Fermi gas* behave as they "cross over" from acting like a Bose Einstein condensate, in which atom pairs form tightly bound molecules, to behaving like pairs of separated electrons in a superconductor. In the new study, JILA scientists applied a technique they developed in 2008

The JILA scientists performed comparable measurements for an ultracold gas of potassium atoms at and above temperatures where superfluidity disappears. Like the superconductor group, the JILA team found evidence of atom pairing above the critical temperature. This demonstrates the existence of a so-called "pseudo-gap region" where the system retains some pairs of correlated fermions but not all characteristics of superfluidity. The findings were made possible in part by significant improvements in the signal strength of the atom photoemission spectroscopy technique since 2008.

"What makes this really interesting is that the two systems are actually very different, with the high-temperature superconductor being much more complicated than atomic gases," says NIST/JILA Fellow Deborah Jin. "The observation of similar behavior with similar measurements suggests that having a pseudogap phase does not require complicated explanations, such as lattice effects, two-dimensionality, or exotic pairing mechanisms."

Co-authors of the new paper are theorists from the Universita di Camerino in Italy. The research was funded by the National Science Foundation.

* A Fermi gas is a collection of noninteracting particles called fermions, one of two categories of fundamental particles found in nature (bosons are the other). Identical fermions cannot occupy the same place at the same time.


Story Source:

The above story is based on materials provided by National Institute of Standards and Technology (NIST). Note: Materials may be edited for content and length.


Journal Reference:

  1. Gaebler et al. Observation of pseudogap behaviour in a strongly interacting Fermi gas. Nature Physics, 2010; DOI: 10.1038/nphys1709

Cite This Page:

National Institute of Standards and Technology (NIST). "New parallel found between cold gases and 'hot' superconductors." ScienceDaily. ScienceDaily, 9 July 2010. <www.sciencedaily.com/releases/2010/07/100708111338.htm>.
National Institute of Standards and Technology (NIST). (2010, July 9). New parallel found between cold gases and 'hot' superconductors. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2010/07/100708111338.htm
National Institute of Standards and Technology (NIST). "New parallel found between cold gases and 'hot' superconductors." ScienceDaily. www.sciencedaily.com/releases/2010/07/100708111338.htm (accessed September 2, 2014).

Share This




More Matter & Energy News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Australian Airlines Relax Phone Ban Too

Australian Airlines Relax Phone Ban Too

Reuters - Business Video Online (Aug. 26, 2014) Qantas and Virgin say passengers can use their smartphones and tablets throughout flights after a regulator relaxed a ban on electronic devices during take-off and landing. As Hayley Platt reports the move comes as the two domestic rivals are expected to post annual net losses later this week. Video provided by Reuters
Powered by NewsLook.com
Hurricane Marie Brings Big Waves to California Coast

Hurricane Marie Brings Big Waves to California Coast

Reuters - US Online Video (Aug. 26, 2014) Huge waves generated by Hurricane Marie hit the Southern California coast. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Chinese Researchers Might Be Creating Supersonic Submarine

Chinese Researchers Might Be Creating Supersonic Submarine

Newsy (Aug. 26, 2014) Chinese researchers have expanded on Cold War-era tech and are closer to building a submarine that could reach the speed of sound. Video provided by Newsy
Powered by NewsLook.com
Breakingviews: India Coal Strained by Supreme Court Ruling

Breakingviews: India Coal Strained by Supreme Court Ruling

Reuters - Business Video Online (Aug. 26, 2014) An acute coal shortage is likely to be aggravated as India's supreme court declared government coal allocations illegal, says Breakingviews' Peter Thal Larsen. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins