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Superconductivity in SrB3C3 clathrate
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DOI：10.1103/PhysRevResearch.5.013012.png)
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Abstract
En 中文
We predict superconductivity for the carbon-boron clathrate SrB3C3 with Tc = 27-43 K for Coulomb pseudopotential (mu*) 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 K at 50 GPa), show nonhysteretic resistivity drops that track the calculated magnitude and pressure dependence of superconductivity for mu* approximate to 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.
Keywords:
UPPER-CRITICAL-FIELD
TEMPERATURE SUPERCONDUCTIVITY
TRANSITION-TEMPERATURE
LAYERED SUPERCONDUCTOR
CRYSTAL-STRUCTURE
T-C
LANTHANUM
HYDROGEN
HYDRIDE
ENHANCEMENT
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