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Role of frustration and disorder in the competition between antiferromagnetism and quantum spin liquid of organic charge-transfer Mott insulators - Silvia Tomic

Institute of Physics, Zagreb, Croatia

LPS – amphi Moyen

Layered organic solids kappa-(BEDT-TTF)2X are systems in which strong correlations lead to Mott insulating states situated close to the metal-to-insulator phase boundary. These systems are charge-transfer salts i.e. they consist of conducting BEDT-TTF layers separated by non-conducting anion X layers. Within BEDT-TTF layers, the triangular lattices of molecular dimers with one hole per dimer are formed with different degrees of frustration. Moderate pressure in the range of a few hundred bar up to 10 kbar is sufficient to recover metallicity and superconducting ground state. At ambient pressure, the salts kappa-(BEDT-TTF)2Cu2(CN)3 and kappa-(BEDT-TTF)2Ag2(CN)3 have been considered as prime candidates for a quantum spin liquid, while kappa-(BEDT-TTF)2Cu[N(CN)2]Cl has been suggested as a prototypical charge-order-driven antiferromagnet. In this talk I show how the dielectric, dc transport and optical measure¬ments combined with the state-of-the-art DFT calculations provide relevant insights into the important role of disorder and related symmetry reduction for the prevalence of QSL over the antiferromagnetic ordering.


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