Fulleride superconductivity tuned by elastic strain due to cation compositional disorder.

ABSTRACT: Dynamical fluctuations of the elastic strain in strongly correlated systems are known to affect the onset of metal-to-insulator or superconducting transitions. Here we report their effect on the properties of a family of bandwidth-controlled alkali-intercalated fullerene superconductors. We introduce elastic strain through static local structural disorder in a systematic and controllable way in the fcc-structured K _x Cs_3-x C₆₀ (with potassium content, 0.22 ≤ x _K ≤ 2) series of compositions by utilizing the difference in size between the K⁺ and Cs⁺ co-dopants. The occurrence of the crossover from the Mott-Jahn-Teller insulating (MJTI) state into the strongly correlated Jahn-Teller metal (JTM) on cooling i

SUBMITTER: Okur HE 

PROVIDER: S-EPMC11382541 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature