Superconductivity in SrB3C3 clathrate
Li Zhu, Hanyu Liu, Maddury Somayazulu, Yue Meng, Piotr A. Guńka, Thomas B. Shiell, Curtis Kenney-Benson, Stella Chariton, Vitali B. Prakapenka, Hyeok Yoon, Jarryd A. Horn, Johnpierre Paglione, Roald Hoffmann, R. E. Cohen, Timothy A. Strobel
DOI 10.1103/PhysRevResearch.5.013012 · Physical Review Research
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Abstract
We predict superconductivity for the carbon–boron clathrate SrB3C3 with Tc=27–43K 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 (>3000K 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 Tc of approximately 20 K at 40 GPa. Carbon-based clathrates thus represent a class of superconductors similar to other covalent metals like MgB2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrB3C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure unresolved | unknown |
| SrB3C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | 40 GPa | onset |
| SrB3C3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | 23 GPa | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
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