Persistence of fermionic spin excitations through a genuine Mott transition in kappa-type organics

Article

关键词: INSULATOR-TRANSITION;    LIQUID STATE;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.105.125130

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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