Direct evidence for superconductivity in the organic charge density-wave   compound alpha-(BEDT-TTF)_2KHg(SCN)_4 under hydrostatic pressure
  We present direct evidence of a superconducting state existing in the title compound below 300 mK under quasi-hydrostatic pressure. The superconducing transition is observed in the whole pressure range studied, 0 < P < 4 kbar. However, the character of the transition drastically changes with suppressing the charge-density wave state. 
D. Andres, M. V. Kartsovnik, W. Biberacher, K. Neumaier, H. Mueller