Abstract
Systematic magnetotransport measurements as a function of hydrostatic pressure have been made on four members of the α-(BEDT-TTF) 2MHg(SCN) 4 organic conductor family (M = K, Tl, Rb, NH 4). Applied pressure above about 6 Kbar removes the density wave state for M = K, Tl, and Rb. For M = NH 4 the superconducting state is removed with pressure as dT c dP = − 0.25 K/Kbar . In all cases the Shubnikov de Haas oscillation frequency increases with pressure, including the β orbit (which involves the entire Brillouin zone), and new orbits involving very small fractions of the Fermi surface are formed.
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