Contrast reversal of the charge density wave STM image in purple potassium molybdenum bronzeK0.9Mo6O17
| Autor: | Ph. Chevalier, K. M. Zimmermann, J. M. Gomez Rodriguez, Pierre Mallet, Jean-Yves Veuillen, J. Marcus |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Condensed matter physics Scanning tunneling spectroscopy Fermi surface Spin polarized scanning tunneling microscopy Molybdenum bronze Fermi energy law.invention chemistry.chemical_compound chemistry law Condensed Matter::Superconductivity Density of states Condensed Matter::Strongly Correlated Electrons Scanning tunneling microscope Charge density wave |
| Zdroj: | Physical Review B. 60:2122-2126 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.60.2122 |
| Popis: | We report on a scanning tunneling microscopy (STM) investigation of the charge density wave (CDW) state of a layered oxide compound, the purple bronze ${\mathrm{K}}_{0.9}{\mathrm{Mo}}_{6}{\mathrm{O}}_{17}.$ The experiments have been carried out in an ultra-high-vacuum variable-temperature STM. At low temperature, we have observed a $(2\ifmmode\times\else\texttimes\fi{}2)$ superstructure due to the CDW state, superimposed on the atomic lattice. Spectroscopic measurements reveal a strong decrease of the density of states near the Fermi energy, consistent with the suppression of a sizable fraction of the Fermi surface below the CDW transition temperature. Finally, by simultaneous imaging at negative and positive biases, we show a complete spatial separation between occupied and empty states involved in the CDW modulation, resulting in a contrast reversal of the CDW images. |
| Databáze: | OpenAIRE |
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