Record high Tc element superconductivity achieved in titanium

Changling Zhang, Xin He, Chang Liu, Zhiwen Li, Ke Lu, Sijia Zhang, Shaomin Feng, Xiancheng Wang (), Yi Peng, Youwen Long, Richeng Yu, Luhong Wang, Vitali Prakapenka, Stella Chariton, Quan Li, Haozhe Liu, Changfeng Chen () and Changqing Jin ()
Additional contact information
Changling Zhang: Chinese Academy of Sciences
Xin He: Chinese Academy of Sciences
Chang Liu: Jilin University
Zhiwen Li: Chinese Academy of Sciences
Ke Lu: Chinese Academy of Sciences
Sijia Zhang: Chinese Academy of Sciences
Shaomin Feng: Chinese Academy of Sciences
Xiancheng Wang: Chinese Academy of Sciences
Yi Peng: Chinese Academy of Sciences
Youwen Long: Chinese Academy of Sciences
Richeng Yu: Chinese Academy of Sciences
Luhong Wang: Shanghai Advanced Research in Physical Sciences
Vitali Prakapenka: University of Chicago
Stella Chariton: University of Chicago
Quan Li: Jilin University
Haozhe Liu: Center for High Pressure Science & Technology Advanced Research
Changfeng Chen: University of Nevada
Changqing Jin: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract It is challenging to search for high Tc 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 Tc above 20 K in wide pressure range from 108 GPa to 240 GPa in titanium. The maximum Tconset above 26.2 K and zero resistance Tczero of 21 K are record high values hitherto achieved among element superconductors. The Hc2(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 Tc 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 Tc superconductors among simple materials via pressure tuned unconventional mechanism.

Date: 2022
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DOI: 10.1038/s41467-022-33077-3

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