Magnetic and electronic phase diagram and superconductivity in the organic superconductors<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">ET</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>X</mml:mi></mml:math>

The magnetic susceptibility of the organic superconductors $\ensuremath{\kappa}\ensuremath{-}(\mathrm{h}8\mathrm{}or\mathrm{}\mathrm{d}8\ensuremath{-}\mathrm{E}\mathrm{T}{)}_{2}X,$ $X=\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ and $\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ has been studied. A metallic phase below ${T}^{*}=37--38 \mathrm{K}$ for $X=\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ and 46--50 K for $X=\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ has an anisotropic temperature dependence of the susceptibility and the charge transport. Partial charge-density-wave or charge fluctuation is expected to coexist with the metallic phase instead of the large antiferromagnetic fluctuation above ${T}^{*}.$ The phase diagram and the superconductivity of $\ensuremath{\kappa}\ensuremath{-}(\mathrm{ET}{)}_{2}X$ are discussed in connection with this phase.

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