Published January 12, 2023
| Version v1
Journal article
Open
Superconductivity in ${\mathrm{SrB}}_{3}{\mathrm{C}}_{3}$ clathrate
Creators
- 1. Carnegie Institution for Science
- 2. Argonne National Laboratory
- 3. University of Chicago
- 4. University of Maryland
- 5. Cornell University
Description
We predict superconductivity for the carbon--boron clathrate ${\mathrm{SrB}}_{3}{\mathrm{C}}_{3}$ with ${T}_{c}=27\text{--}43\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ for Coulomb pseudopotential (μ ∗)values between 0.17 and 0.10 using first-principles calculations with conventional electron--phonon coupling. Electrical transport measurements, facilitated by an in situ experimental design compatible with extreme synthesis conditions ($>3000\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ at 50 GPa), show nonhysteretic resistivity drops that track the calculated magnitude and pressure dependence of superconductivity for μ ∗ ≈ 0.15, and transport measurements collected under applied magnetic fields indicate superconductivity with an onset ${T}_{c}$ of approximately 20 K at 40 GPa. Carbon-based clathrates thus represent a class of superconductors similar to other covalent metals like ${\mathrm{MgB}}_{2}$ and doped fullerenes. Carbon clathrates share structures similar to superconducting superhydrides with wide potential for tunable properties, and covalent C--B bonds allow metastable persistence at ambient conditions.
Files
PhysRevResearch.5.013012.pdf
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Additional details
Identifiers
- DOI
- 10.1103/physrevresearch.5.013012
- Other
- oai:uchicago.tind.io:11643
Funding
- National Science Foundation
- U.S. Department of Energy
- DE-SC0020683
- U.S. Department of Energy
- DE-FG02-94ER14466
- U.S. Department of Energy
- DE-AC02-06CH11357
- Gordon and Betty Moore Foundation
- GBMF9071
- University of Maryland
- Narodowa Agencja Wymiany Akademickiej
- PPN/BEK/2018/1/00035
- Argonne National Laboratory