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Scientists gain insight on mechanism of unconventional superconductivity

Date:
October 18, 2016
Source:
Ames Laboratory
Summary:
A systematic investigation into the properties of the newest family of unconventional superconducting materials, iron-based compounds, has been conducted by researchres. The study may help the scientific community discover new superconducting materials with unique properties.
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A crystal sample of one of the iron-based unconventional superconductors studied by Ames Laboratory scientists. Their systematic investigation of this class of superconductors may lead to the creation of new materials with unique superconducting properties.
Credit: U.S. Department of Energy, Ames Laboratory

Researchers at the U.S. Department of Energy's Ames Laboratory and partner institutions conducted a systematic investigation into the properties of the newest family of unconventional superconducting materials, iron-based compounds. The study may help the scientific community discover new superconducting materials with unique properties.

Researchers combined innovative crystal growth, highly sensitive magnetic measurements, and the controlled introduction of disorder through electron bombardment to create and study an entire range of compositions within a class of iron-based superconductors. They found that the key fundamental properties -- transition temperature and magnetic field penetration depth -- of these complex superconductors were dependent on composition and the degree of disorder in the material structure.

"This was a systematic approach to more fully understand the behavior of unconventional superconductors," said Ruslan Prozorov, Ames Laboratory faculty scientist and professor in the Department of Physics and Astronomy at Iowa State University. "We found that some proposed models of unconventional superconductivity in these iron-based compounds were compatible with our results, and this study further limited the possible theoretical mechanisms of superconductivity."

That information will also serve as a resource for future research into unconventional superconductors.

"This study fleshed out the knowledge of a class of materials more completely and in a way that will be helpful to the scientific community as they search for high temperature superconductors. Knowing how transition temperature is affected by composition, magnetic field and structural disorder gives science a better idea of where to dig -- it contributes to the goal of discovery by design, creating materials that do exactly what we want them to do," said Prozorov.


Story Source:

Materials provided by Ames Laboratory. Note: Content may be edited for style and length.


Journal Reference:

  1. K. Cho, M. Konczykowski, S. Teknowijoyo, M. A. Tanatar, Y. Liu, T. A. Lograsso, W. E. Straszheim, V. Mishra, S. Maiti, P. J. Hirschfeld, R. Prozorov. Energy gap evolution across the superconductivity dome in single crystals of (Ba1-xKx)Fe2As2. Science Advances, 2016; 2 (9): e1600807 DOI: 10.1126/sciadv.1600807

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Ames Laboratory. "Scientists gain insight on mechanism of unconventional superconductivity." ScienceDaily. ScienceDaily, 18 October 2016. <www.sciencedaily.com/releases/2016/10/161018193159.htm>.
Ames Laboratory. (2016, October 18). Scientists gain insight on mechanism of unconventional superconductivity. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2016/10/161018193159.htm
Ames Laboratory. "Scientists gain insight on mechanism of unconventional superconductivity." ScienceDaily. www.sciencedaily.com/releases/2016/10/161018193159.htm (accessed May 24, 2017).

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