Two independent studies report superconductivity at record high temperatures in hydrogen-rich materials under extreme pressure.
Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures
Maddury Somayazulu, Muhtar Ahart, Ajay K. Mishra, Zachary M. Geballe, Maria Baldini, Yue Meng, Viktor V. Struzhkin, and Russell J. Hemley
Phys. Rev. Lett. 122, 027001 (2019)
Published January 14, 2019
A. P. Drozdov, M. I. Eremets, I. A. Troyan, V. Ksenofontov, and S. I. Shylin, “Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system,” Nature 525, 73 (2015).
M. Somayazulu, M. Ahart, A. K. Mishra, Z. M. Geballe, M. Baldini, Y. Meng, V. V. Struzhkin, and R. J. Hemley, “Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures,” Phys. Rev. Lett. 122, 027001 (2019).
A. P. Drozdov et al., “Superconductivity at 250 K in lanthanum hydride under high pressures,” arXiv:1812.01561.
N. W. Ashcroft, “Metallic hydrogen: A high-temperature superconductor?,” Phys. Rev. Lett. 21, 1748 (1968).