Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Glimpse of Heavy Electrons Reveals “Hidden Order”

Abstract:
Researchers unravel 25-year-old physics mystery

Glimpse of Heavy Electrons Reveals “Hidden Order”

Los Alamos, NM | Posted on June 3rd, 2010

Unconventional use of a well-known scientific instrument has helped scientists from Los Alamos National Laboratory, Brookhaven National Laboratory, and other institutions unravel a 25-year-old physics mystery and reveal a "hidden order" of the electronic structure inside an unusual superconducting material.

In a paper released today in Nature, Alexander Balatsky of Los Alamos' Theoretical Division, Séamus Davis of Brookhaven National Laboratory, and Graeme Luke of McMaster University (Ontario, Canada) describe the use of spectroscopic imaging scanning tunneling microscopy to view the "hidden order" of electrons within uranium ruthenium silicate as it is cooled to very low temperatures. The research could lead to engineered materials that exhibit superconductivity by helping physicists better understand the behavior of heavy fermion materials—exotic compounds whose slow-moving electrons behave as if they have a mass 1,000 times greater than ordinary free electrons.

Since 1984, just prior to the cusp of discovery of high-temperature superconducting materials, scientists studying the behavior of heavy fermion materials noticed that as the superconducting material uranium ruthenium silicate was cooled to temperatures below 55 degrees Kelvin (minus 360 degrees Fahrenheit), its specific heat increased.

In simple terms, specific heat is a measure of the amount of energy (heat) required to raise the temperature of a material; the increase in specific heat showed that for some reason the material was absorbing more energy than at room temperature. Some physicists theorized that perhaps the energy was needed to maintain some type of unusual or unseen order of the material's atomic lattice.

At 17.5 Kelvin (minus 428 Fahrenheit), the specific heat increase was far greater than any measured magnetization would suggest, presenting researchers a materials mystery.

"For 25 years there was this idea that there was some kind of hidden order of electrons occurring within these materials at lower temperatures," said Balatsky. "It was like having a pebble in your shoe. You know something is there, but you can't see it. It becomes so maddening that eventually you have to take off your shoe and take a really good look."

Fortunately for physicists, a modern spectroscopic technique called scanning tunneling microscopy provided the right tools for a look inside the analogous shoe.

Balatsky and colleagues pioneered a way to use the spectroscopic imaging scanning tunneling microscope (SI-STM) to look at the structure of the heavy fermion material as it cooled. The microscopic probe scans an area just above the surface of a tiny grain of material. Small changes in the electronic structure are detected by the apparatus as the probe dances above the surface of the material. The result is somewhat like a topographic map of the material's electronic structure, showing peaks and valleys of areas dense with electrons or barren of charge.

As the material cooled below 55 Kelvin, the SI-STM revealed the appearance of "heavy" electrons. Because of the relationship between kinetic energy and mass, slower electrons appear heavier than freely moving electrons. At 17.5 Kelvin, the topographical map created by the SI-STM revealed a specific, clearly recognizable pattern—a previously hidden order—that is seen as an onset of additional dramatic slowing of electron waves due to interference with uranium atoms within the material. Scientists could finally see the pebble in the shoe.

The remarkable breakthrough helps validate theory behind the observed increase in specific heat of the material. More important, researchers have now confirmed the ability to directly visualize atomic interactions that are responsible for fermion "heaviness" in these materials. This ability could allow researchers to engineer materials with specific superconducting properties or other desirable attributes and directly observe the electronic interactions within them. Ongoing theoretical modeling at Los Alamos of hidden order is a viable tool in this quest for new material properties.

The research received funding from the U.S. Department of Energy Office of Science's Office of Basic Energy Sciences, as well as Canada's Natural Sciences and Engineering Research Council and the Canadian Institute for Advanced Research.

####

About Los Alamos National Laboratory
Los Alamos National Laboratory, a multidisciplinary research institution engaged in strategic science on behalf of national security, is operated by Los Alamos National Security, LLC, a team composed of Bechtel National, the University of California, The Babcock & Wilcox Company, and URS for the Department of Energy’s National Nuclear Security Administration.

Los Alamos enhances national security by ensuring the safety and reliability of the U.S. nuclear stockpile, developing technologies to reduce threats from weapons of mass destruction, and solving problems related to energy, environment, infrastructure, health, and global security concerns.

For more information, please click here

Contacts:
JAMES E. RICKMAN
505-665-9203

Copyright © Los Alamos National Laboratory

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

A new, tunable device for spintronics: An international team of scientists including physicist Jairo Sinova from the University of Mainz realises a tunable spin-charge converter made of GaAs August 29th, 2014

Nanoscale assembly line August 29th, 2014

New analytical technology reveals 'nanomechanical' surface traits August 29th, 2014

New Vice President Takes Helm at CNSE CMOST: Catherine Gilbert To Lead CNSE Children’s Museum of Science and Technology Through Expansion And Relocation August 29th, 2014

Physics

New technique uses fraction of measurements to efficiently find quantum wave functions August 28th, 2014

Creation of a Highly Efficient Technique to Develop Low-Friction Materials Which Are Drawing Attention in Association with Energy Issues August 26th, 2014

X-ray Laser Probes Tiny Quantum Tornadoes in Superfluid Droplets: SLAC Experiment Reveals Mysterious Order in Liquid Helium August 25th, 2014

Rice physicist emerges as leader in quantum materials research: Nevidomskyy wins both NSF CAREER Award and Cottrell Scholar Award August 20th, 2014

Govt.-Legislation/Regulation/Funding/Policy

New analytical technology reveals 'nanomechanical' surface traits August 29th, 2014

New Vice President Takes Helm at CNSE CMOST: Catherine Gilbert To Lead CNSE Children’s Museum of Science and Technology Through Expansion And Relocation August 29th, 2014

Leading European communications companies and research organizations have launched an EU project developing the future 5th Generation cellular mobile networks August 28th, 2014

New technique uses fraction of measurements to efficiently find quantum wave functions August 28th, 2014

Possible Futures

Air Force’s 30-year plan seeks 'strategic agility' August 1st, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Virus structure inspires novel understanding of onion-like carbon nanoparticles April 10th, 2014

Local girl does good March 22nd, 2014

Discoveries

A new, tunable device for spintronics: An international team of scientists including physicist Jairo Sinova from the University of Mainz realises a tunable spin-charge converter made of GaAs August 29th, 2014

Nanoscale assembly line August 29th, 2014

Copper shines as flexible conductor August 29th, 2014

Novel 'butterfly' molecule could build new sensors, photoenergy conversion devices August 28th, 2014

Announcements

A new, tunable device for spintronics: An international team of scientists including physicist Jairo Sinova from the University of Mainz realises a tunable spin-charge converter made of GaAs August 29th, 2014

Nanoscale assembly line August 29th, 2014

New analytical technology reveals 'nanomechanical' surface traits August 29th, 2014

New Vice President Takes Helm at CNSE CMOST: Catherine Gilbert To Lead CNSE Children’s Museum of Science and Technology Through Expansion And Relocation August 29th, 2014

Tools

New analytical technology reveals 'nanomechanical' surface traits August 29th, 2014

Ultra-Low Frequency Vibration Isolation Stabilizes Scanning Tunneling Microscopy at UCLA’s Nano-Research Group August 28th, 2014

Measure Both Elastic and Viscous Properties with AFM Using Asylum Research’s Exclusive AM-FM Viscoelastic Mapping Mode August 28th, 2014

Malvern specialists to deliver inaugural short course on polymer characterization at Interplas 2014 August 27th, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE