Disorder unveils Mott quantum criticality behind a first-order transition in the quasi-two-dimensional organic conductor κ − ( ET ) 2 Cu [ N ( CN ) 2 ] Cl

We show the significant impact of weak disorder on the Mott transition by investigating electronic transport in a systematically x-ray-irradiated layered organic conductor under continuous pressure control. The critical end point of the first-order Mott transition is dramatically suppressed by such...

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Bibliographic Details
Published in:Physical review. B 2019-06, Vol.99 (24), p.1, Article 245139
Main Authors: Urai, Mizuki, Furukawa, Tetsuya, Seki, Yasuhide, Miyagawa, Kazuya, Sasaki, Takahiko, Taniguchi, Hiromi, Kanoda, Kazushi
Format: Article
Language:English
Subjects:
Conductors
Electron transport
Superconductivity
Transition temperature
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Summary:We show the significant impact of weak disorder on the Mott transition by investigating electronic transport in a systematically x-ray-irradiated layered organic conductor under continuous pressure control. The critical end point of the first-order Mott transition is dramatically suppressed by such weak disorder that causes only a minor reduction in the transition temperature of disorder-sensitive nodal superconductivity. Instead, quantum critical scaling of resistance holds at lower temperatures and Fermi-liquid coherence temperature on the metallic side is lowered. Introducing disorder unveils the interaction-induced quantum criticality hidden behind the first-order transition.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.245139