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• W2058174925 endingPage "884" @default.
• W2058174925 startingPage "880" @default.
• W2058174925 abstract "The Mott transition between an insulator and a metal can be tuned by applying pressure, which affects the electronic correlations. In an insulating organic salt, NMR studies reveal that the spin fluctuations are suppressed whereas the conductance is enhanced by the same critical exponent as pressure drives the insulator into a bad metal. Near a Mott transition1, which can be tuned by controlling either the charge-carrier density (‘filling’) or the correlation strength (‘bandwidth’), lies fascinating emergent behaviour, such as unconventional superconductivity2,3, and the understanding of the underlying Mott criticality is a longstanding challenge. Recent studies have showed that the bandwidth-controlled Mott criticality (BCMC) involves critical fluctuations in charge4,5 and lattice6,7 degrees of freedom. Spin is another degree of freedom and its antiferromagnetic fluctuations are ubiquitous in strongly correlated electrons8,9. However, the magnetic aspects of BCMC are unexplored. Here, we report on the magnetic criticality brought about by BCMC. Through NMR investigations on a κ-type organic salt, we observe critical suppression of antiferromagnetic fluctuations accompanied by the critical enhancement of conductance. The two criticalities show the same exponent within experimental error. Site-to-site electron hopping introduces doubly occupied and empty sites, which extinguish stroboscopically the local spins, probably resulting in the identical criticality in charge and spin." @default.
• W2058174925 created "2016-06-24" @default.
• W2058174925 creator A5026360115 @default.
• W2058174925 creator A5037987179 @default.
• W2058174925 creator A5075886172 @default.
• W2058174925 date "2009-10-18" @default.
• W2058174925 modified "2023-10-03" @default.
• W2058174925 title "Magnetic Mott criticality in a κ-type organic salt probed by NMR" @default.
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• W2058174925 doi "https://doi.org/10.1038/nphys1428" @default.
• W2058174925 hasPublicationYear "2009" @default.
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