Fulleride superconductivity tuned by elastic strain due to cation compositional disorder
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10485928" target="_blank" >RIV/00216208:11320/24:10485928 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-dkcoYsNoX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-dkcoYsNoX</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d4sc03399j" target="_blank" >10.1039/d4sc03399j</a>
Alternative languages
Result language
angličtina
Original language name
Fulleride superconductivity tuned by elastic strain due to cation compositional disorder
Original language description
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 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemical Science
ISSN
2041-6520
e-ISSN
2041-6539
Volume of the periodical
15
Issue of the periodical within the volume
40
Country of publishing house
GB - UNITED KINGDOM
Number of pages
9
Pages from-to
16485-16493
UT code for WoS article
001310292200001
EID of the result in the Scopus database
2-s2.0-85203628954