@article{e0f66e851d6848c19b4d3eb3fd5ec90a,
title = "Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors",
abstract = "Controlled access to the border of the Mott insulating state by variation of control parameters offers exotic electronic states such as anomalous and possibly high-transition-temperature (Tc) superconductivity. The alkali-doped fullerides show a transition from a Mott insulator to a superconductor for the first time in three-dimensional materials, but the impact of dimensionality and electron correlation on superconducting properties has remained unclear. Here we show that, near the Mott insulating phase, the upper critical field Hc2 of the fulleride superconductors reaches values as high as ∼90 T - the highest among cubic crystals. This is accompanied by a crossover from weak- to strong-coupling superconductivity and appears upon entering the metallic state with the dynamical Jahn-Teller effect as the Mott transition is approached. These results suggest that the cooperative interplay between molecular electronic structure and strong electron correlations plays a key role in realizing robust superconductivity with high-Tc and high-Hc2.",
author = "Y. Kasahara and Y. Takeuchi and Zadik, {R. H.} and Y. Takabayashi and Colman, {R. H.} and McDonald, {R. D.} and Rosseinsky, {M. J.} and K. Prassides and Y. Iwasa",
note = "Funding Information: This work was supported in part by Grants-in-Aid for Specially Promoted Research (No 25000003), for Young Scientists (B) (No 2474022), and for Scientific Research on Innovative Areas '3D Active-Site Science' (No 26105004) and 'J-Physics' (No 15H05882) from JSPS, Japan, and SICORP-LEMSUPER FP7-NMP-2011-EU-Japan project (No 283214). This work was also supported by the Mitsubishi Foundation and sponsored by the 'World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials,' Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. K.P. and M.J.R. thank EPSRC for support (EP/K027255 and EP/K027212). M.J.R. is a Royal Society Research Professor. RMcD acknowledges support from U.S. Department of Energy Office of Basic Energy Sciences 'Science at 100 T' program and that a portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No DMR-1157490 and the State of Florida. Publisher Copyright: {\textcopyright} The Author(s) 2017.",
year = "2017",
month = feb,
day = "17",
doi = "10.1038/ncomms14467",
language = "English",
volume = "8",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}