Recently many people discuss unconventional density waves (i.e. unconventional charge density waves (UCDW) and unconventional spin density waves (USDW)). Unlike in conventional density waves, the quasiparticle spectrum in these systems is gapless. Also these systems remain metallic. Indeed it appears that there are many candidates for UDW. The low temperature phase of α-(BEDT-TTF)2KHg(SCN)4, th...

We analyze the charge transport between a one-dimensional weakly interacting electron gas and a superconductor within the scaling approach in the basis of scattering states. We derive the renormalization group equations, which fully account for the intrinsic energy dependence due to Andreev reflection. A strong renormalization of the corresponding reflection phase is predicted even for a perfec...

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In the two-dimensional organic superconductor K-(BEDT-TTF)2I 3 de Haas-van Alphen oscillations were observed at magnetic fields above 5 T and temperatures between 0.4 and 2 K. We found two dHvA frequencies at 3.846 kT and 0.570 kT, which correspond to the cross-sectional areas of the Fermi surface expected from a tight-binding calculation. From the temperature dependence of the oscillation ampl...

We have employed uniaxial stress along the principal axes of the quasi-two dimensional organic superconductor κ–(BEDT-TTF)2Cu(SCN)2. The lattice anisotropy is thereby altered, with corresponding changes in the intermolecular transfer energies. The effect of uniaxial stress on the superconducting transition temperature Tc and critical field Bc2 is found to be anisotropic.There is an indication o...

We have measured the in-plane and out-of-plane resistivities of the organic superconductor p-(BEDTTTF)zAuIz with disorder introduced by x-ray irradiation. [Here BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene]. For defect concentrations less than 0.15% per mole, Matthiessen's rule is obeyed at all temperatures and a T Z term in the resistivity is found in the temperature region between 5 and ...

We report detailed angle dependent studies of the metallic state microwave (40 to 200 GHz) magneto-conductivity of single crystal samples of the a-(BEDT-TTF)2KHg(SCN)4 organic charge density wave conductor, and the perovskite superconductor SraRuO^ We observe series' of resonant absorptions which we attribute to periodic orbit resonances a phenomenon closely related to cyclotron resonance. By p...