It is challenging to search for high T superconductivity (SC) in transition metal elements wherein d electrons are usually not favored by conventional BCS theory. Here we report experimental discovery of surprising SC up to 310 GPa with T above 20 K in wide pressure range from 108 GPa to 240 GPa in titanium. The maximum T above 26.2 K and zero resistance T of 21 K are record high values hitherto achieved among element superconductors. The H(0) is estimated to be ∼32 Tesla with coherence length 32 Å. The results show strong s-d transfer and d band dominance, indicating correlation driven contributions to high T SC in dense titanium. This finding is in sharp contrast to the theoretical predications based on pristine electron-phonon coupling scenario. The study opens a fresh promising avenue for rational design and discovery of high T superconductors among simple materials via pressure tuned unconventional mechanism.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9478155 | PMC |
| http://dx.doi.org/10.1038/s41467-022-33077-3 | DOI Listing |
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