Record-High Superconductivity in Niobium-Titanium Alloy.
basic_science · Level V
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- Record sourced from PubMed, PMID 30614584.
- Also identified by DOI 10.1002/adma.201807240.
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Abstract
The extraordinary superconductivity has been observed in a pressurized commercial niobium-titanium alloy. Its zero-resistance superconductivity persists from ambient pressure to the pressure as high as 261.7 GPa, a record-high pressure up to which a known superconducting state can continuously survive. Remarkably, at such an ultra-high pressure, although the ambient pressure volume is shrunk by 45% without structural phase transition, the superconducting transition temperature (T<sub>C</sub> ) increases to ≈19.1 K from ≈9.6 K, and the critical magnetic field (H<sub>C2</sub> ) at 1.8 K has been enhanced to 19 T from 15.4 T. These results set new records for both the T<sub>C</sub> and the H<sub>C2</sub> among all the known alloy superconductors composed of only transition metal elements. The remarkable high-pressure superconducting properties observed in the niobium-titanium alloy not only expand the knowledge on this important commercial superconductor but also are helpful for a better understanding on the superconducting mechanism.