park_nano_research_grant.jpg

Physicists uncover new competing state of matter in superconducting material



A team of experimentalists at the U.S. Department of Energy's Ames Laboratory and theoreticians at University of Alabama Birmingham discovered a remarkably long-lived new state of matter in an iron pnictide superconductor, which reveals a laser-induced formation of collective behaviors that compete with superconductivity.

"Superconductivity is a strange state of matter, in which the pairing of electrons makes them move faster," said Jigang Wang, Ames Laboratory physicist and Iowa State University professor. "One of the big problems we are trying to solve is how different states in a material compete for those electrons, and how to balance competition and cooperation to increase temperature at which a superconducting state emerges."

To get a closer look, Wang and his team used laser pulses of less than a trillionth of a second in much the same way as flash photography, in order to take a series of snapshots. Called terahertz spectroscopy, this technique can be thought of as "laser strobe photography" where many quick images reveal the subtle movement of electron pairings inside the materials using long wavelength far-infrared light.

"The ability to see these real time dynamics and fluctuations is a way to understanding them better, so that we can create better superconducting electronics and energy-efficient devices," said Wang.

Non-equilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of Photo-Induced Excitonic Spin-Density-Wave State X. Yang, L. Luo, M. Mootz, A. Patz, S. L. Budko, P. C. Canfield, I. E. Perakis, J. Wang Phys. Rev. Lett. 121, 267001 (2018) DOI: 10.1103/PhysRevLett.121.267001

Contact information:

Prof. Jigang Wang Iowa State University, College of Liberal arts & Sciences, Dept. of Physics & Astronomy jgwang@iastate.edu Tel: 515-294-5630 URL: http://cmp.physics.iastate.edu/ultrafast/

U.S. Department of Energy's Ames Laboratory

#Superconductivity #MaterialScience

 

STAY CURRENT WITH THE NWA NEWSLETTER DELIVERED TO YOUR INBOX.

FOUNDING MEMBERS

Multifunctional e-glasses monitor health, protect eyes, control video game

Clean without scrubbing and using chemicals

Designing a flexible material to protect buildings, military personnel

Triggered by light, a novel way to switch on an enzyme

High-resolution 3D view inside tumors

New 5G switch provides 50 times more energy efficiency than currently exists

Nanodevices show how cells change with time, by tracking from the inside