Superconductivity at high temperatures is expected in elements with low atomic numbers, based in part on conventional BCS (Bardeen–Cooper–Schrieffer) theory1. For example, it has been predicted that when hydrogen is compressed to its dense metallic phase (at pressures exceeding 400 GPa), it will become superconducting with a transition temperature above room temperature2. Such pressures are difficult to produce in a laboratory setting, so the predictions are not easily confirmed. Under normal conditions lithium is the lightest metal of all the elements, and may become superconducting at lower pressures3,4; a tentative observation of a superconducting transition in Li has been previously reported5. Here we show that Li becomes superconducting at pressures greater than 30 GPa, with a pressure-dependent transition temperature (Tc) of 20 K at 48 GPa. This is the highest observed Tc of any element; it confirms the expectation that elements with low atomic numbers will have high transition temperatures, and suggests that metallic hydrogen will have a very high Tc. Our results confirm that the earlier tentative claim5 of superconductivity in Li was correct.
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Bardeen, J., Cooper, L. N. & Schrieffer, J. R. Theory of superconductivity. Phys. Rev. 108, 1175–1204 (1957)
Richardson, C. F. & Ashcroft, N. W. High temperature superconductivity in metallic hydrogen: Electron-electron enhancements. Phys. Rev. Lett. 78, 118–121 (1997)
Allen, P. B. & Cohen, M. L. Pseudopotential calculation of the mass enhancement and superconducting transition temperature of simple metals. Phys. Rev. 187, 525–538 (1969)
Richardson, C. F. & Ashcroft, N. W. Effective electron-electron interactions and the theory of superconductivity. Phys. Rev. B 55, 15130–15145 (1997)
Lin, T. H. & Dunn, K. J. High-pressure and low-temperature study of electrical resistance of lithium. Phys. Rev. B 33, 807–811 (1986)
Neaton, J. B. & Ashcroft, N. W. Pairing in dense lithium. Nature 400, 141–144 (1999)
Hanfland, M., Syassen, K., Christensen, N. E. & Novikov, D. L. New high-pressure phase of lithium. Nature 408, 174–178 (2000)
Christensen, N. E. & Novikov, D. L. Predicted superconductive properties of lithium under pressure. Phys. Rev. Lett. 86, 1861–1864 (2001)
Hanfland, M., Loa, I., Syassen, K., Schwarz, U. & Takemura, K. Equation of state of lithium to 21 GPa. Solid State Commun. 112, 123–127 (1999)
We thank H. Goto for technical support in machining the pit-anvils. This work was supported by a Grant-in-Aid for COE (Center of Excellence) Research and Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
The authors declare that they have no competing financial interests.
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Shimizu, K., Ishikawa, H., Takao, D. et al. Superconductivity in compressed lithium at 20 K. Nature 419, 597–599 (2002). https://doi.org/10.1038/nature01098
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