Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na 1.5 ( PO 2 ) 4 ( WO 3 ) 20

We report an investigation of the combined structural and electronic properties of the bronze Na1.5(PO2)4(WO3)20. Its low dimensional structure and possible large reconstruction of the Fermi surface due to charge density wave instability makes this bulk material a natural superlattice with a reduced number of carriers and Fermi energy. Signatures of multilayered 2D electron weak localization are consequently reported, with an enhanced influence of quantum oscillations. A crossover between these two antagonistic entities previously observed only in genuine low dimensional materials and devices, is shown to occur in a bulk crystal due to its hidden 2D nature.