Rutgers physics professors find new order in quantum electronic material
Two Rutgers physics professors have proposed an explanation for a new type of order, or symmetry, in an exotic material made with uranium -- a theory that may one day lead to enhanced computer displays and data storage systems and more powerful superconducting magnets for medical imaging and levitating high-speed trains. Their discovery, published in this week's issue of the journal Nature, has piqued the interest of scientists worldwide. It is one of the rare theory-only papers that this selective publication accepts.
Collaborating with the Rutgers professors was a postdoctoral researcher at Massachusetts Institute of Technology (MIT) who earned her doctorate at Rutgers.
"Scientists have seen this behavior for 25 years, but it has eluded explanation." said Piers Coleman, professor in the Department of Physics and Astronomy in the School of Arts and Sciences. When cooled to 17.5 degrees above absolute zero or lower (a bone-chilling minus 428 degrees Fahrenheit), the flow of electricity through this material changes subtly.
The material essentially acts like an electronic version of polarized sunglasses, he explains. Electrons behave like tiny magnets, and normally these magnets can point in any direction. But when they flow through this cooled material, they come out with their magnetic fields aligned with the material's main crystal axis.
This effect, claims Coleman, comes from a new type of hidden order, or symmetry, in this material's magnetic and electronic properties. Changes in order are what make liquid crystals, magnetic materials and superconductors work and perform useful functions.
"Our quest to understand new types of order is a vital part of understanding how materials can be developed to benefit the world around us," he said.
Similar discoveries have led to technologies such as liquid crystal displays, which are now ubiquitous in flat-screen TVs, computers and smart phones, although the scientists are quick to acknowledge that their theoretical discovery won't transform high-tech products overnight.
Coleman, along with Rutgers colleague Premala Chandra and MIT collaborator Rebecca Flint, describe what they call a "hidden order" in this compound of uranium, ruthenium and silicon. Uranium is commonly known for being nuclear reactor fuel or weapons material, but in this case physicists value it as a heavy metal with electrons that behave differently than those in common metals.
Recent experiments on the material at the National High Magnetic Field Laboratory at Los Alamos National Laboratory in New Mexico provided the three physicists with data to refine their discovery.
"We've dubbed our fundamental new order 'hastatic' order, named after the Greek word for spear," said Chandra, also a professor in the Department of Physics and Astronomy. The name reflects the highly ordered properties of the material and its effect on aligning electrons that flow through it.
"This new category of order may open the world to new kinds of materials, magnets, superconductors and states of matter with properties yet unknown," she said. The scientists have predicted other instances where hastatic order may show up, and physicists are beginning to test for it.
The scientists' work was funded by the National Science Foundation and the Simons Foundation. Flint is a Simons Postdoctoral Fellow in physics at MIT.
Source: Rutgers University
- New order found in quantum electronic material: May open door to new kinds of materials, magnets and superconductorsfrom Science DailyWed, 30 Jan 2013, 22:00:36 EST
- Physicists find new order in quantum electronic materialfrom PhysorgWed, 30 Jan 2013, 17:30:43 EST
Latest Science NewsletterGet the latest and most popular science news articles of the week in your Inbox! It's free!
Learn more about
Check out our next project, Biology.Net
From other science news sites
Popular science news articles
- Evidence of ancient life discovered in mantle rocks deep below the seafloor
- Sex-specific biomarkers are needed to learn why heart attacks kill more women than men
- Scientists describe new clam species from depths off Canada's Atlantic coast
- UCI study finds dramatic increase in concurrent droughts, heat waves
- How wind sculpted Earth's largest dust deposit
- Massive study reports challenges in reproducing published psychology findings
- Mystery of polar bear Knut's disease finally solved
- Future climate models greatly affected by fungi and bacteria
- Scientists identify possible key in virus, cancer research
- Women more likely than men to initiate divorces, but not non-marital breakups