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- W2023686886 abstract "Scanning tunneling microscope (STM) images of charge-density waves (CDW's) formed in the layered-structure dichalcogenide crystals ${mathrm{TaS}}_{2}$ and ${mathrm{TaSe}}_{2}$ have been obtained with a microscope operating in a bath of liquid nitrogen. In 1T-${mathrm{TaS}}_{2}$ and 1T-${mathrm{TaSe}}_{2}$ the images show a hexagonal network of mounds spaced at the CDW wavelength, ${ensuremath{lambda}}_{mathrm{CDW}=phantom{rule{0ex}{0ex}}mathrm{ensuremath{surd}}13phantom{rule{0ex}{0ex}}{a}_{0}}$ where ${a}_{0}$ is the atom spacing. The microscope tip deflection in the constant-current mode is extremely large (ensuremath{sim}2 Ar{}) which gives an image of the 1T-phase surface which is completely dominated by the CDW. In 2H-${mathrm{TaSe}}_{2}$ the CDW is much weaker and careful adjustment of the microscope parameters can give STM images which show superimposed modulations at the atomic wavelength and at the CDW wavelength, ${ensuremath{lambda}}_{mathrm{CDW}=3{a}_{0}}$. However, in general the STM scans of the 2H phases are dominated by patterns at the atomic wavelength. At 77 K the 4Hb-${mathrm{TaS}}_{2}$ crystals produce STM images with some areas showing atoms only and others showing CDW's only consistent with the existence of a CDW in the octahedral layers only. The STM results for all of the phases of ${mathrm{TaS}}_{2}$ and ${mathrm{TaSe}}_{2}$ are consistent with the expected variations in the CDW formation and electron transfer as determined by calculation and experiment. However, the unusually large deflection of the tunneling tip caused by the stronger CDW amplitudes in the 1T phases needs further analysis." @default.
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- W2023686886 date "1986-07-15" @default.
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- W2023686886 title "Charge-density waves studied with the use of a scanning tunneling microscope" @default.
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- W2023686886 doi "https://doi.org/10.1103/physrevb.34.994" @default.
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