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'Perfectly frustrated' metal provides possible path to superconductivity

Date:
November 9, 2017
Source:
DOE/Ames Laboratory
Summary:
The US Department of Energy's Ames Laboratory has discovered and described the existence of a unique disordered electron spin state in a metal that may provide a unique pathway to finding and studying frustrated magnets. Their unique properties are of interest in the development of quantum computing and high-temperature superconductivity.
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The U.S. Department of Energy's Ames Laboratory has discovered and described the existence of a unique disordered electron spin state in a metal that may provide a unique pathway to finding and studying frustrated magnets.

Condensed matter physicists use the term "frustrated" to describe a kind of magnet in which the spins fail to align into stable magnetic order. In perfectly frustrated magnets called spin liquids, the disordered magnetism of these materials persists even at very low temperatures, and their unique properties are of interest in the development of quantum computing and high-temperature superconductivity.

The materials investigated to search for this perfectly frustrated magnetic state are typically insulators. But Ames Laboratory researchers were able to define a "perfectly frustrated" state in a metallic material, CaCo1.86As2.

"Perfectly frustrated systems, ones that really cannot resolve their magnetic states, are difficult to find in the first place, but even more so in a metal," said Rob McQueeney, scientist at Ames Laboratory.

In insulating magnets, the interactions between spins that lead to frustration are set by the crystal structure of the lattice, and are relatively immutable. The discovery of this nearly perfectly frustrated metal provides a new avenue for tinkering with the magnetic interactions to achieve perfect frustration.

"Here, we have a little knob that we can tune. We know that some of these interactions that lead to frustration are mediated by conduction electrons, and we can tune a number of those very accurately -- maybe you get a superconductor, maybe some other novel quantum state. There's a lot of promise there."


Story Source:

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


Journal Reference:

  1. A. Sapkota, B. G. Ueland, V. K. Anand, N. S. Sangeetha, D. L. Abernathy, M. B. Stone, J. L. Niedziela, D. C. Johnston, A. Kreyssig, A. I. Goldman, R. J. McQueeney. Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet CaCo2−yAs2. Physical Review Letters, 2017; 119 (14) DOI: 10.1103/PhysRevLett.119.147201

Cite This Page:

DOE/Ames Laboratory. "'Perfectly frustrated' metal provides possible path to superconductivity." ScienceDaily. ScienceDaily, 9 November 2017. <www.sciencedaily.com/releases/2017/11/171109224032.htm>.
DOE/Ames Laboratory. (2017, November 9). 'Perfectly frustrated' metal provides possible path to superconductivity. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2017/11/171109224032.htm
DOE/Ames Laboratory. "'Perfectly frustrated' metal provides possible path to superconductivity." ScienceDaily. www.sciencedaily.com/releases/2017/11/171109224032.htm (accessed March 28, 2024).

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