Transport Properties of Quasi‐Two‐Dimensional Mo4O11 Crystals

The electrical resistivity under hydrostatic pressure up to 1.0 GPa, Hall effect, magnetoresistance, and thermoelectric power are measured over the temperature range from 1.5 to 300 K for both, orthorhombic γ‐Mo4O11 and monoclinic η‐Mo4O11 crystals with quasi‐two‐dimensional structures. All these properties show anomalies associated with the charge density wave (CDW) transition; particularly the hydrostatic pressure enhances the CDW instabilities through the increased electron–phonon interaction and partial nesting of the Fermi surfaces. It is also found that both, electrons and holes contribute to the conduction processes, for which a qualitative discussion is made.