Featured Research

from universities, journals, and other organizations

Scientists discover new family of quasicrystals

Date:
June 10, 2013
Source:
DOE/Ames Laboratory
Summary:
Scientists have discovered a new family of rare-earth quasicrystals using an algorithm they developed to help pinpoint them. Their research resulted in finding the only known magnetic rare earth icosahedral binary quasicrystals, now providing a "matched set" of magnetic quasicrystals and their closely related periodic cousins.

The pentagonal dodecahedral morphology of the icosahedral phase is shown with a millimeter scale; grains as large as 1.0 mm have been grown.
Credit: Image courtesy of DOE/Ames Laboratory

Scientists at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered a new family of rare-earth quasicrystals using an algorithm they developed to help pinpoint them. Quasicrystalline materials may be found close to crystalline phases that contain similar atomic motifs, called crystalline approximants. And just like fishing experts know that casting a line in the right habitat hooks the big catch, the scientists used their knowledge to hone in on just the right spot for new quasicrystal materials discovery.

Their research resulted in finding the only known magnetic rare earth icosahedral binary quasicrystals, now providing a "matched set" of magnetic quasicrystals and their closely related periodic cousins.

The discovery has been published online by the journal Nature Materials in an article, "A family of binary magnetic icosahedral quasicrystals based on rare earth and cadmium."

"There's been a lot of theoretical and experimental work on magnetic quasicrystals and mathematically there's no reason why magnetic ordering can't happen," said Goldman. "But experimentally it was never observed. Why? What does this teach us about magnetism in complex environments?"

A few years ago, a series of periodic approximants of rare-earth cadmium were discovered that did order magnetically by research colleagues in Japan. The Ames Laboratory scientists worked to characterize by scattering the magnetic structures in collaboration with other researchers from France, Japan, and the United States.

Goldman and Canfield suspected that there could be quasicrystals very close to these rare earth cadmium approximants, hidden in very limited regions of temperature and composition space in the phase diagram, and most easily attainable through the flux growth method Canfield has used to grow other quasicrystals. Together with Ames Lab scientists Sergey Bud'ko, Andreas Kreyssig, Kevin Dennis, Mehmet Ramazanoglu, Anton Jesche, and physics graduate student Tai Kong, Goldman and Canfield initiated a new search for magnetic quasicrystals.

Goldman asked Canfield to start by growing the approximant, but Canfield was shooting for both.

"My intent was not just to go to the approximant, but to cool this as far as I could before everything solidified; I was fishing for the binary quasicrystal," Canfield said. "It was an attempt to survey the system. I know there's an approximant in there, but is there another surprise?"

And sure enough, there was. Canfield had grown the approximant, but he also found the presence of faceted pentagonal dodecahedra, one of the signatures of quasicrystals. Goldman's x-ray scattering work confirmed the material as a quasicrystal.

In the rare earth cadmium approximants, there is magnetic order. In the quasicrystalline materials, however, the scientists found spin glass behavior, similar to the magnetic behavior in amorphous materials.

"What we have here is proof of principle. Yes, you can find quasicrystals near approximants; you just have to search the right way," said Canfield.

"There's still work to be done; it's my hope that there is lurking out there a quasicrystalline antiferromagnet, which means an ordered magnetic structure. It hasn't been theoretically ruled out," said Goldman. "What I do know is that quasicrystals continue to surprise me."

The research was supported by DOE's Office of Science.


Story Source:

The above story is based on materials provided by DOE/Ames Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. Alan I. Goldman, Tai Kong, Andreas Kreyssig, Anton Jesche, Mehmet Ramazanoglu, Kevin W. Dennis, Sergey L. Bud’ko, Paul C. Canfield. A family of binary magnetic icosahedral quasicrystals based on rare earths and cadmium. Nature Materials, 2013; DOI: 10.1038/nmat3672

Cite This Page:

DOE/Ames Laboratory. "Scientists discover new family of quasicrystals." ScienceDaily. ScienceDaily, 10 June 2013. <www.sciencedaily.com/releases/2013/06/130610133238.htm>.
DOE/Ames Laboratory. (2013, June 10). Scientists discover new family of quasicrystals. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2013/06/130610133238.htm
DOE/Ames Laboratory. "Scientists discover new family of quasicrystals." ScienceDaily. www.sciencedaily.com/releases/2013/06/130610133238.htm (accessed July 22, 2014).

Share This




More Matter & Energy News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
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