A high-pressure NMR study of sodium tungsten bronze: NaxWO3
| Autor: | W Ramage, D P Tunstall |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Sodium tungsten bronze
Materials science Condensed matter physics Relaxation (NMR) General Engineering Nuclear resonance General Physics and Astronomy chemistry.chemical_element Electron Condensed Matter Physics Thermal conduction chemistry.chemical_compound chemistry Impurity Condensed Matter::Strongly Correlated Electrons Atomic physics Helium |
| Zdroj: | Journal of Physics C: Solid State Physics. 13:725-738 |
| ISSN: | 0022-3719 |
| Popis: | Cubic NaxWO3 has been studied at helium temperatures in samples ranging from x=0.22 up to x=0.84. The Knight shifts, the spin-lattice relaxation times T1, their dependences on pressure up to 45 kbar, the T2 of the free-induction decays and the T2 of the spin-echo signals have all been measured by nuclear resonance techniques. In the low-x region, evidence is produced suggesting that the conduction electrons acquire 3d character and an impurity band is formed. The data on the lowest-x sample is consistent with Mott's suggestion (1977) that at this value of x the impurity band is narrow, with the metal-non-metal transition occurring in the impurity band where the electrons are localised through an Anderson-type mechanism. |
| Databáze: | OpenAIRE |
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