Layered monophosphate tungsten bronzes [Ba(PO4)2]WmO3m-3: 2D-metals with locked charge-density-wave instabilities - Université de Lille Accéder directement au contenu
Article Dans Une Revue Angewandte Chemie International Edition Année : 2023

Layered monophosphate tungsten bronzes [Ba(PO4)2]WmO3m-3: 2D-metals with locked charge-density-wave instabilities

Résumé

Phosphate tungsten and molybenum bronzes represent an outstanding class of materials displaying textbook examples of charge-density-wave (CDW) physics among other fundamental properties. Here we report on the existence of a novel structural branch with the general formula [Ba(PO4)2][WmO3m−3] (m=3, 4 and 5) denominated ′layered monophosphate tungsten bronzes′ (L-MPTB). It results from thick [Ba(PO4)2]4− spacer layers disrupting the cationic metal-oxide 2D units and enforcing an overall trigonal structure. Their symmetries are preserved down to 1.8 K and the compounds show metallic behaviour with no clear anomaly as a function of temperature. However, their electronic structure displays the characteristic Fermi surface of previous bronzes derived from 5d W states with hidden nesting properties. By analogy with previous bronzes, such a Fermi surface should result into CDW order. Evidence of CDW order was only indirectly observed in the low-temperature specific heat, giving an exotic context at the crossover between stable 2D metals and CDW order.
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hal-04137570 , version 1 (22-06-2023)

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Hicham Nimoh, Angel Arevalo Lopez, Marielle Huvé, Claire Minaud, Andrés Cano, et al.. Layered monophosphate tungsten bronzes [Ba(PO4)2]WmO3m-3: 2D-metals with locked charge-density-wave instabilities. Angewandte Chemie International Edition, 2023, 62 (25), pp.e202302049. ⟨10.1002/anie.202302049⟩. ⟨hal-04137570⟩
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