Persistence of fermionic spin excitations through a genuine Mott transition in κ-type organics
Persistence of fermionic spin excitations through a genuine Mott transition in κ-type organics
复制标题
通过 κ 型有机物中真正的莫特跃迁保持费米子自旋激发
DOI：
10.1103/physrevb.105.125130
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发表时间：
2022
影响因子：
3.7
通讯作者：
Nakazawa Y.
中科院分区：
文献类型：
--
作者：
Imajo S.;Kato N.;Marckwardt R. J.;Yesil E.;Akutsu H.;Nakazawa Y.
研究了有机二聚体-Mott体系κ-[（BEDSe-TTF）x（BEDT-TTF）1−x]2Cu[N（CN）2]Br中化学取代引起的电子态从费米液体到量子自旋液体的连续变化.电输运测量表明，BEDSe-TTF混合到BEDT-TTF层诱导量子莫特跃迁周围。虽然电荷间隙在这一点上消失，磁化率和热容测量表明，费米低能激发仍然存在于绝缘盐中，这表明费米自旋激发仍然存在。我们建议，过渡可以归类为一个真正的莫特过渡。
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 κ-[(BEDSe-TTF)x(BEDT-TTF)1−x]2Cu[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. 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.