Author(s) Guo, J.; Lin, G.; Cai, S.; Xi, C.; Zhang, C.; Sun, W.; Wang, Q.; Yang, K.; Li, A.; Wu, Q.; Zhang, Y.; Xiang, T.; Cava, R.Joseph; Sun, L.
Journal Adv Mater
Date Published 2019 Jan 07

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 ) increases to ≈19.1 K from ≈9.6 K, and the critical magnetic field (H ) at 1.8 K has been enhanced to 19 T from 15.4 T. These results set new records for both the T and the H 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.

DOI 10.1002/adma.201807240
ISSN 1521-4095
Citation Adv Mater Weinheim. 2019:e1807240.

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