Fulleride superconductivity tuned by elastic strain due to cation compositional disorder

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dc.authorid0000-0003-4524-3084
dc.authorid0000-0002-3493-2194
dc.authorid0000-0001-8163-9065
dc.authorid0000-0003-3439-0716
dc.authorid0000-0002-5039-9764
dc.contributor.authorOkur, H. Esma
dc.contributor.authorColman, Ross H.
dc.contributor.authorTakabayashi, Yasuhiro
dc.contributor.authorJeglic, Peter
dc.contributor.authorOhishi, Yasuo
dc.contributor.authorKato, Kenichi
dc.contributor.authorPrassides, Kosmas
dc.date.accessioned2026-02-08T15:15:30Z
dc.date.available2026-02-08T15:15:30Z
dc.date.issued2024
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractDynamical 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 KxCs3-xC60 (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 is evidenced for the compositions with x(K) < 1.28 by both synchrotron X-ray powder diffraction (SXRPD) - anomalous reduction of the unit cell volume - and Cs-133 NMR spectroscopy - sudden suppression in the Cs-133 spin-lattice relaxation rates. The emerging superconducting state with a maximum critical temperature, T-c = 30.9 K shows a characteristic dome-like dependence on the unit-cell volume or equivalently, on the ratio between the on-site Coulomb repulsion, U, and the bandwidth, W. However, compared to the parent Cs3C60 composition in which cation disorder effects are completely absent, the maximum T-c is lower by similar to 12%. The reduction in T-c displays a linear dependence on the variance of the tetrahedral-site cation size, sigma(2)(T), thus establishing a clear link between structural-disorder-induced attenuation of critical elastic strain fluctuations and the electronic ground state.
dc.description.sponsorshipJapan Atomic Energy Agency [JP21H01907, JP22K18693]; Japan Atomic Energy Agency (JAEA) (REIMEI Research Program) [P1-0125, J1-3007]; Grants-in-Aid for Scientific Research [22K18693, 21H01907] Funding Source: KAKEN
dc.description.sponsorshipWe thank the ESRF and SPring-8 for access to synchrotron X-ray facilities. This work was financially supported by Grants-in-Aid for Scientific Research (JSPS KAKENHI Grant Numbers JP21H01907 and JP22K18693), the Japan Atomic Energy Agency (JAEA) (REIMEI Research Program) and the Slovenian Research Agency (Grant Numbers P1-0125 and J1-3007). The experiments at SPring-8 were performed under Proposals No. 2013A1194 and 2017A1363.
dc.identifier.doi10.1039/d4sc03399j
dc.identifier.issn2041-6520
dc.identifier.issn2041-6539
dc.identifier.issue40
dc.identifier.pmid39263659
dc.identifier.scopus2-s2.0-85203628954
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1039/d4sc03399j
dc.identifier.urihttps://hdl.handle.net/20.500.12885/5809
dc.identifier.volume15
dc.identifier.wosWOS:001310292200001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherRoyal Soc Chemistry
dc.relation.ispartofChemical Science
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzWOS_KA_20260207
dc.subjectTemperature
dc.titleFulleride superconductivity tuned by elastic strain due to cation compositional disorder
dc.typeArticle

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