UNUSUAL SPECTRAL SIGNATURES OF ORGANIC 1D METALS

We have studied by high resolution angle resolved photoelectron spectr oscopy the spectral properties of two metallic and one insulating Bech gaard salts, quasi-1D organic materials. The spectra of the metals sho w no dispersing quasiparticle peak crossing the Fermi level. Instead a deep pseudogap is observed. The spectral lineshape is incompatible wi th that of ''normal'' metals. The spectrum of the insulator exhibits a real energy gap.