Magneto-transport properties in the density wave phase of β′′-(BEDT-TTF)₂CsCd(SCN)₄

Magneto-transport properties of the newly prepared layer-structured organic conductor β′′-(BEDT-TTF)₂CsCd(SCN)₄ are investigated. Temperature dependence of the interlayer resistance without magnetic fields shows a hump-like anomaly between 32 K and 5 K at ambient pressure. Measurements of the Shubnikov-de Haas oscillations indicate that the electronic structure at low temperature is different from that calculated from the crystal structure at room temperature. Under magnetic fields parallel to the layer, magnetic field dependence of the interlayer resistance also shows a large dip-like anomaly below 32 K, where the hump-like anomaly starts to appear. We suggest that the hump-like anomaly of β′′-(BEDTTTF) ₂CsCd(SCN)₄is a density wave transition accompanied by nesting of its one dimensional Fermi surfaces, and that the dip-like anomaly in the magneto-resistance is ascribed to magnetic field dependence of the interlayer hopping of electrons.