Transport Properties of Quasi‐Two‐Dimensional Mo₄O₁₁ Crystals

Abstract

The electrical resistivity under hydrostatic pressure up to 1 .O GPa, Hall effect, magnetoresistance, and thermoelectric power are measured over the temperature range from 1.5 to 300 K for both, orthorhombic y-Mo,O,, and monoclinic q-Mo,O,, 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.

Preparation and characterization of metallorganic chemical vapour deposited LixMoyOz using a single source solid precursor

“…Many molybdenum oxides, MoO3_~ (0 ~ x -< 1), ranging from conducting MoO2 to insulating MoO3 [13] and Mo4Oll , which have exhibited Charge Density Wave (CDW) transitions, are known [14]. The nonstoichiometric oxides have also been characterized and found to have complicated structures.…”

Transient Thermoelectric Effect in Quasi‐Two‐Dimensional η‐Mo4O11 Crystal

“…U at the normal state rises drastically to a positive value of about 100 pV within a short period (= 50 ns), followed by exponential decays over the time range of about 50 ps with the characteristic relaxation times 5, and z2 to a constant negative value (U z -3 pV). Here it is interesting to note that the observed Hall coefficient R, of this material is positive, but the static thermoelectric power S is negative over the wide temperature range 10 to 300 K and at liquid He temperatures it shows a sign reversal from negative to positive or vice versa with varying temperature [6]. In view of these static data, the observed decay profile at the normal state (Fig.…”

Local heating effect in point-contact spectroscopy for magnetic metals of Ni and ?-Mn

“…The homojunction point-contact of two pieces of the samples, in which both the "spear" and "anvil" consist of the same material, were realized L N 9 , using an improved apparatus, as shown schematically in Fig. 1, instead of the previously-used mechanical differential screw method.…”