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Helium ‘balloons’ offer new path to control complex materials

Posted at 9:29 am June 30, 2015
By Oak Ridge National Laboratory Leave a Comment

Helium Atoms into Crystalline Film

Inserting helium atoms (visualized as a red balloon) into a crystalline film (gold) allowed Oak Ridge National Laboratory researchers to control the material’s elongation in a single direction. (Submitted image)

 

Researchers at Oak Ridge National Laboratory have developed a new method to manipulate a wide range of materials and their behavior using only a handful of helium ions.

The team’s technique, published in Physical Review Letters, advances the understanding and use of complex oxide materials that boast unusual properties such as superconductivity and colossal magnetoresistance but are notoriously difficult to control.

For the first time, ORNL researchers have discovered a simple way to control the elongation of a crystalline material along a single direction without changing the length along the other directions or damaging the crystalline structure. This is accomplished by adding a few helium ions into a complex oxide material and provides a never before possible level of control over magnetic and electronic properties.

“By putting a little helium into the material, we’re able to control strain along a single axis,” said ORNL’s Zac Ward, who led the team’s study. “This type of control wasn’t possible before, and it allows you to tune material properties with a finesse that we haven’t previously had access to.” [Read more…]

Filed Under: Front Page News, Oak Ridge National Laboratory, Top Stories, U.S. Department of Energy Tagged With: Andreas Herklotz, Anthony Wong, C.M. Gonzalez, Center for Nanophase Materials Sciences, Christianne Beekman, crystalline film, crystalline material, Elbio Dagotto, Hangwen Guo, helium, John Budai, LSMO, Oak Ridge National Laboratory, Office of Science, ORNL, oxide material, Paul Snijders, Philip Rack, Physical Review Letters, R. Timilsina, Shuai Dong, strain doping, Strain doping: Reversible single axis control of a complex oxide lattice via helium implantation, Thomas Ward, U.S. Department of Energy, Wolter Siemons, Zac Ward, Zheng Gai

ORNL finding goes beyond surface of oxide films

Posted at 9:57 pm August 13, 2013
By Oak Ridge National Laboratory Leave a Comment

Oxide Figure

This figure shows the spectroscopic measurement (current as a function of voltage) and this as a function of temperature. (Reproduced by permission of The Royal Society of Chemistry)

Better batteries, catalysts, electronic information storage and processing devices are among potential benefits of an unexpected discovery made by Oak Ridge National Laboratory scientists using samples isolated from the atmosphere.

Researchers at the U.S. Department of Energy lab learned that key surface properties of complex oxide films are unaffected by reduced levels of oxygen during fabrication—an unanticipated finding with possible implications for the design of functional complex oxides used in a variety of consumer products, said Zheng Gai, a member of DOE’s Center for Nanoscale Materials Sciences at ORNL.

The findings are detailed in a paper published in Nanoscale. [Read more…]

Filed Under: Oak Ridge National Laboratory, Science, Top Stories, U.S. Department of Energy Tagged With: batteries, catalysts, Center for Nanoscale Materials Sciences, CNMS, complex oxides, DOE, electronic information storage, manganite, Materials Science and Technology Division, nanoscale, Oak Ridge National Laboratory, ORNL, oxide films, Paul Snijders, processing devices, scanning probe microscopy, U.S. Department of Energy, Zheng Gai

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