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Study probes relationship between strange metals and high-temperature superconductors

Computer simulations yield a much more accurate picture of these states of matter

Date:
November 21, 2019
Source:
DOE/SLAC National Accelerator Laboratory
Summary:
Theorists have observed strange metallicity in a well-known model for simulating the behavior of materials with strongly correlated electrons, which join forces to produce unexpected phenomena rather than acting independently. Their work provides a foundation for connecting theories of strange metals to models of superconductors and other strongly correlated materials.
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Strange metals make interesting bedfellows for a phenomenon known as high-temperature superconductivity, which allows materials to carry electricity with zero loss.

Both are rule-breakers. Strange metals don't behave like regular metals, whose electrons act independently; instead their electrons behave in some unusual collective manner. For their part, high-temperature superconductors operate at much higher temperatures than conventional superconductors; how they do this is still unknown.

In many high-temperature superconductors, changing the temperature or the number of free-flowing electrons in the material can flip it from a superconducting state to a strange metal state or vice versa.

Scientists are trying to find out how these states are related, part of a 30-year quest to understand how high-temperature superconductors work so they can be developed for a host of potential applications, from maglev trains to perfectly efficient power transmission lines.

In a paper published today in Science, theorists with the Stanford Institute for Materials and Energy Sciences (SIMES) at the Department of Energy's SLAC National Accelerator Laboratory report that they have observed strange metallicity in the Hubbard model. This is a longstanding model for simulating and describing the behavior of materials with strongly correlated electrons, meaning that the electrons join forces to produce unexpected phenomena rather than acting independently.

Although the Hubbard model has been studied for decades, with some hints of strange metallic behavior, this was the first time strange metallicity had been seen in Monte Carlo simulations, in which billions of separate and slightly different calculations are averaged to produce an unbiased result. This is important because the physics of these systems can change drastically and without warning if any approximations are introduced.

The SIMES team was also able to observe strange metallicity at the lowest temperatures ever explored with an unbiased method -- temperatures at which the conclusions from their simulations are much more relevant for experiments.

The scientists said their work provides a foundation for connecting theories of strange metals to models of superconductors and other strongly correlated materials.


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


Journal Reference:

  1. Edwin Huang et al. Strange metallicity in the doped Hubbard model. Science, 2019 DOI: 10.1126/science.aau7063

Cite This Page:

DOE/SLAC National Accelerator Laboratory. "Study probes relationship between strange metals and high-temperature superconductors." ScienceDaily. ScienceDaily, 21 November 2019. <www.sciencedaily.com/releases/2019/11/191121151209.htm>.
DOE/SLAC National Accelerator Laboratory. (2019, November 21). Study probes relationship between strange metals and high-temperature superconductors. ScienceDaily. Retrieved December 11, 2024 from www.sciencedaily.com/releases/2019/11/191121151209.htm
DOE/SLAC National Accelerator Laboratory. "Study probes relationship between strange metals and high-temperature superconductors." ScienceDaily. www.sciencedaily.com/releases/2019/11/191121151209.htm (accessed December 11, 2024).

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