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ORNL: Neutrons find ‘missing’ magnetism of plutonium

Posted at 12:44 pm July 12, 2015
By Oak Ridge National Laboratory Leave a Comment

Doug Abernathy and Marc Janoschek

Doug Abernathy, left, ARCS instrument scientist at Oak Ridge National Laboratory, and Marc Janoschek, Los Alamos National Laboratory, prepare their sample for experiments at the Spallation Neutron Source. (Photo by ORNL)

 

Groundbreaking work at two U.S. Department of Energy national laboratories has confirmed plutonium’s magnetism, which scientists have long theorized but have never been able to experimentally observe. The advances that enabled the discovery hold great promise for materials, energy, and computing applications.

Plutonium was first produced in 1940, and its unstable nucleus allows it to undergo fission, making it useful for nuclear fuels as well as for nuclear weapons. Much less known, however, is that the electronic cloud surrounding the plutonium nucleus is equally unstable and makes plutonium the most electronically complex element in the periodic table, with intriguingly intricate properties for a simple elemental metal.

While conventional theories have successfully explained plutonium’s complex structural properties, they also predict that plutonium should order magnetically. This is in stark contrast with experiments, which had found no evidence for magnetic order in plutonium. [Read more…]

Filed Under: Front Page News, Oak Ridge National Laboratory, Top Stories, U.S. Department of Energy Tagged With: ARCS, B. Chakrabarti, DOE, Doug Abernathy, dynamical mean field theory, electrons, Eric Bauer, European Commission, F. Trouw, G. Kotliar, G.H. Lander, J.-X. Zhu, J.D. Thompson, J.M. Lawrence, J.N. Mitchell, K. Haule, Lawrence Livermore National Laboratory, Los Alamos National Laboratory, Los Alamos National Laboratory Directed Research and Development, M. Ramos, magnetic fluctuations, magnetic order, magnetism, Marc Janoschek, Mark Lumsden, national laboratories, neutron spectroscopy, Oak Ridge Leadership Computing Facility, Oak Ridge National Laboratory, Office of Science, OLCF, ORNL, Pinaki Das, plutonium, plutonium ion, plutonium nucleus, plutonium-239, plutonium-242, Rutgers University, S. Richmond, Science Advances, Scott McCall, Siegfried Hecker, Spallation Neutron Source, U.S. Department of Energy

Nobel Laureate launches Wigner Distinguished Lecture Series at ORNL

Posted at 10:53 pm October 28, 2013
By Oak Ridge National Laboratory Leave a Comment

Albert Fert

Albert Fert

Three more Nobel winners, former Intel chairman among nine confirmed speakers

Four Nobel Laureates are among nine lecturers who will be participating in the new Eugene P. Wigner Distinguished Lecture Series in Science, Technology, and Policy at Oak Ridge National Laboratory.

Albert Fert, recipient of the 2007 Nobel Prize in Physics, opens the series on Nov. 4 at 10 a.m. in the Iran Thomas Auditorium at ORNL’s Spallation Neutron Source.

“The Wigner lectures aim to invigorate scientific discovery and technological innovation and to initiate productive scientific policy debate,” said Thom Mason, laboratory director. [Read more…]

Filed Under: Oak Ridge National Laboratory, Science, Top Stories Tagged With: Ada Yonath, Amit Goyal, Arun Majumdar, C.N.R. Rao, Craig Barrett, Eugene P. Wigner Distinguished Lecture Series, Eugene Wigner, Frances Arnold, Graphite Reactor, materials research, Nobel Laureate, Nobel Prize, Novel Directions for Spintronics: Spin-orbitronics and Magnetic Skyrmions, Oak Ridge National Laboratory, ORNL, Peter Grünberg, Science Technology and Policy, Siegfried Hecker, Steven Chu, Thom Mason, Venkatraman Ramakrishnan

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