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An organic Mott insulator, $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Cl, wasinvestigated by resistance measurements under continuously controllable He gaspressure. The first-order Mott transition was demonstrated by observation ofclear jump in the resistance variation against pressure. Its critical endpointat 38 K is featured by vanishing of the resistive jump and critical divergencein pressure derivative of resistance, $|\frac{1}{R}\frac{\partial R}{\partialP}|$, which are consistent with the prediction of the dynamical mean fieldtheory and have phenomenological correspondence with the liquid-gas transition.The present results provide the experimental basis for physics of the Motttransition criticality.Comment: 4 pages, 5 figure

physical review. b, condensed matter and materials physics

Transport criticality of the first-order Mott transition in the quasi-two-dimensional organic conductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi><mml:mo>−</mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant="normal">BEDT</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">TTF</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:mo…

Transport criticality of the first-order Mott transition in the quasi-two-dimensional organic conductorκ−(BEDT−TTF)2Cu