Abstract
Magnetotransport has been studied on the quasi-two-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2m for m = 4, 6 and 7. These series provide a model system where the low-dimensional character and the electron density can be changed with m. In P4W8O32 (m = 4) and P4W12O44 (m = 6), both Hall effect and magnetoresistance data corroborate the existence of two successive charge density wave transitions. Large anisotropic magneto-resistance in the low-temperature state is well accounted for by the presence of small electron and hole pockets with large mobilities. In P4W14O50 (m = 7), the high-temperature transition, close to first order, may be associated with strong electron-phonon coupling or strong electron-electron interactions. The low-temperature transition is mainly structural.
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