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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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Saito, Yohei
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Publications (3/3 displayed)
- 2021Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition
- 2019Bandwidth-tuning from insulating Mott quantum spin liquid to Fermi liquid via chemical substitution in $κ$-[(BEDT-TTF)$_{1-x}$(BEDT-STF)$_x$ ] $_2$Cu$_2$(CN)$_3$
- 2019Low-Temperature Dielectric Anomalies at the Mott Insulator-Metal Transition
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Bandwidth-tuning from insulating Mott quantum spin liquid to Fermi liquid via chemical substitution in $κ$-[(BEDT-TTF)$_{1-x}$(BEDT-STF)$_x$ ] $_2$Cu$_2$(CN)$_3$
Abstract
The electronic properties of molecular conductors can be readily varied via physical or chemical pressure as it increases the bandwidth W; this enables crossing the Mott insulator-to-metal phase transition by reducing electronic correlations U/W. Here we introduce an alternative path by increasing the molecular orbitals when partially replacing sulfur by selenium in the constituting bis-(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) molecules of the title compound. We characterize the tuning of the insulating quantum spin liquid state via a Mott transition to the metallic Fermi-liquid state by transport, dielectric, and optical measurements. At this first-order phase transition, metallic regions coexist in the insulating matrix leading to pronounced percolative effects most obvious in a strong enhancement of the dielectric constant at low temperatures.