From Mott state to superconductivity in 1T-TaS2

From Mott state to superconductivity in 1T-TaS2

September 18, 2008 | B. Sipos, A.F. Kusmartseva, A. Akrap, H. Berger, L. Forro, E. Tutis
The study investigates the coexistence of superconductivity and other electronic states in 1T-TaS₂, a layered material known for its Mott phase. The researchers observed a series of low-temperature electronic states in 1T-TaS₂ under pressure, where the Mott phase melts into a textured charge density wave (CDW) state. Superconductivity emerged within this CDW state and persisted even as the CDW state disappeared and the normal state properties changed significantly. This is the first reported case of superconductivity in a pristine 1T transition metal dichalcogenide compound. The superconductivity first developed within a state marked by commensurability-driven, Coulombically frustrated electronic phase separation. The pressure was used to influence electronic interactions without increasing disorder, providing a unique tool to study the material's electronic ground states. The findings contribute to the understanding of the complex interplay between different electronic collective states in solids.The study investigates the coexistence of superconductivity and other electronic states in 1T-TaS₂, a layered material known for its Mott phase. The researchers observed a series of low-temperature electronic states in 1T-TaS₂ under pressure, where the Mott phase melts into a textured charge density wave (CDW) state. Superconductivity emerged within this CDW state and persisted even as the CDW state disappeared and the normal state properties changed significantly. This is the first reported case of superconductivity in a pristine 1T transition metal dichalcogenide compound. The superconductivity first developed within a state marked by commensurability-driven, Coulombically frustrated electronic phase separation. The pressure was used to influence electronic interactions without increasing disorder, providing a unique tool to study the material's electronic ground states. The findings contribute to the understanding of the complex interplay between different electronic collective states in solids.
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