Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 23, Issue 2, Pages 153-160Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201201513
Keywords
charge transport; electronic structures; electronic processes; nanowires; doping
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Funding
- National Science Foundation [DMR 0847169, DMR 0847324, DMR-0946404]
- Research Corporation for Science Advancement
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0847324, 0946404] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0847169] Funding Source: National Science Foundation
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The roster of materials exhibiting metalinsulator transitions with sharply discontinuous switching of electrical conductivity close to room temperature remains rather sparse, despite the fundamental interest in the electronic instabilities manifested in such materials and the plethora of potential technological applications ranging from frequency-agile metamaterials to electrochromic coatings and Mott field-effect transistors. Here, unprecedented, pronounced metal-insulator transitions induced by application of a voltage are demonstrated for nanowires of a vanadium oxide bronze with intercalated divalent cations, beta-PbxV2O5 (x approximate to 0.33). The induction of the phase transition through application of an electric field at room temperature makes this system particularly attractive and viable for technological applications. A mechanistic basis for the phase transition is proposed based on charge disproportionation evidenced at room temperature in near-edge X-ray absorption fine structure (NEXAFS) spectroscopy measurements, ab initio density functional theory calculations of the band structure, and electrical transport data, suggesting that transformation to the metallic state is induced by melting of specific charge localization and ordering motifs extant in these materials.
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