Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors

Kasahara, Y, Takeuchi, Y, Zadik, RH, Takabayashi, Y, Colman, RH, McDonald, RD, Rosseinsky, MJ ORCID: 0000-0002-1910-2483, Prassides, K and Iwasa, Y (2017) Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors NATURE COMMUNICATIONS, 8 (1). 14467-. ISSN 2041-1723, 2041-1723

Text Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors.pdf - Author Accepted Manuscript Download (763kB)

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 (T<inf>c</inf>) 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 H<inf>c2</inf> 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-T<inf>c</inf> and high-H<inf>c2</inf>.

Item Type:	Article
Uncontrolled Keywords:	51 Physical Sciences, 5104 Condensed Matter Physics
Depositing User:	Symplectic Admin
Date Deposited:	30 Mar 2017 09:48
Last Modified:	23 May 2026 00:40
DOI:	10.1038/ncomms14467
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3006721
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