1. Persistence of fermionic spin excitations through a genuine Mott transition in $\kappa$-type organics
- Author
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Imajo, Shusaku, Kato, Naoko, Marckwardt, Robert J., Yesil, Emre, Akutsu, Hiroki, and Nakazawa, Yasuhiro
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Materials Science ,Condensed Matter - Superconductivity - Abstract
We investigate the continuous variation of electronic states from a Fermi liquid to a quantum spin liquid induced by chemical substitution in the organic dimer-Mott system of $\kappa$-[(BEDSe-TTF)$_x$(BEDT-TTF)$_{1-x}$]$_2$Cu[N(CN)$_2$]Br. Electrical transport measurements reveal that the mixing of BEDSe-TTF into the BEDT-TTF layers induces a quantum Mott transition around $x$=0.10. Although a charge gap disappears at this point, magnetic susceptibility and heat capacity measurements indicate that fermionic low-energy excitations remain in the insulating salts, suggesting that fermionic spin excitations persist. We propose that the transition can be classified into a genuine Mott transition., Comment: 7pages, 1 table, and 4 figures
- Published
- 2022
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