Saito, YoheiLöhle, AnjaKawamoto, AtsushiPustogow, AndrejDressel, Martin2023-06-262023-06-2620212073-43521852136405http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-132311http://elib.uni-stuttgart.de/handle/11682/13231http://dx.doi.org/10.18419/opus-13212The quantum spin liquid candidate 𝜅-(BEDT-TTF)2Cu2(CN)3 has been established as the prime example of a genuine Mott insulator that can be tuned across the first-order insulator–metal transition either by chemical substitution or by physical pressure. Here, we explore the superconducting state that occurs at low temperatures, when both methods are combined, i.e., when 𝜅-[(BEDT-TTF)1-𝑥(BEDT-STF)𝑥]2Cu2(CN)3 is pressurized. We discovered superconductivity for partial BEDT-STF substitution with x = 0.10–0.12 even at ambient pressure, i.e., a superconducting state is realized in the range between a metal and a Mott insulator without magnetic order. Furthermore, we observed the formation of a superconducting dome by pressurizing the substituted crystals; we assigned this novel behavior to disorder emanating from chemical tuning.eninfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/4.0/530article2021-08-01