Illustration from Scientific Research

A 140 nm thin single-crystalline filament of κ-(BEDT-TTF)2Cu2(CN)3 was placed on a flexible PET substrate. Cooling from 300 K down to T → 0 imposes biaxial compression of order 1–2 kbar to the sample due to differential thermal contraction, yielding metallic and superconducting (SC) properties (red arrow in b). Uniaxial tensile strain εc along the c-axis is applied via bending of the substrate in order to tune from the Fermi liquid (FL) through the Mott MIT (blue arrow in b).

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