Nature of the charge density wave images of layered tantalum dichalcogenides 1T-TaX2 (X = sulfur, selenium) in scanning tunneling and atomic force microscopy

Whangbo, M.‐H.; Ren, Jun; Canadell, Enric; Louder, D.; Parkinson, B. A.; Bengel, H.; Magonov, S. N.

doi:10.1021/ja00062a048

Cited by 33 publications

(12 citation statements)

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“…Te atoms at the site A is extremely protruded outside a surface. (18)(19)(20)(21). Our STM image for 1¹-TaS at room temperature shows a superlattice due to quasi-commensurate CDWs and the outward appearances are similar to those of Thomson et al (17) measured at 295 K. The periodicity and the rotation angle are 11.8 A s and 14°, respectively, which are in close agreement with those of the commensurate superlattice.…”

Section: Methodssupporting

confidence: 87%

The Scanning–Tunneling Microscopy, the X-Ray Photoelectron Spectroscopy, the Inner-Shell-Electron Energy-Loss Spectroscopy Studies ofMTe2andM3SiTe6(M=Nb and Ta)

Ohno

1999

Journal of Solid State Chemistry

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Section: Methodssupporting

confidence: 87%

The Scanning–Tunneling Microscopy, the X-Ray Photoelectron Spectroscopy, the Inner-Shell-Electron Energy-Loss Spectroscopy Studies ofMTe2andM3SiTe6(M=Nb and Ta)

Ohno

1999

Journal of Solid State Chemistry

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“…A rather small crystal was chosen of size 0.22ϫ0.28ϫ0.005 mm 3 because of the high absorption coefficient (ϭ699 cm Ϫ1 ). Lattice parameters of the average structure were obtained from the setting angles of 25 reflections in the range 25°Ͻ⌰Ͻ34°, resulting in aϭb ϭ3.4552(2) Å and cϭ25.1495 (13) Å. These values are in agreement with those determined by Ref.…”

Section: Methodssupporting

confidence: 86%

Commensurately modulated structure of4Hb−TaSe2determined by x-ray crystal-structure refinement

et al. 1999

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The (ͱ13aϫͱ13aϫc) superstructure of 4H b -TaSe 2 at room temperature has been determined by x-ray crystal-structure refinement using ͑3ϩ2͒-dimensional superspace. The resulting modulation has its largest amplitudes for a longitudinal displacement of the Ta atoms in the octahedrally coordinated ͑T͒ layers, thus leading to a superstructure of hexagram-shaped clusters containing thirteen Ta atoms each. The atoms in the corresponding planes of Se atoms show a transversal modulation, which can be interpreted as the relaxation of these layers to the modulation of the Ta layers. Forming a similar pattern, modulations were found of the atoms in the layers with Ta in trigonal prismatic coordination (H layers͒, with amplitudes of about 1/10 of the sizes of the modulations in the T layers. These results confirm the presence of a charge-density wave in the T layers, while the modulations of the H layer can be assigned to elastic coupling between the two types of layers. The observation of nonzero displacements of the atoms of the H layers provides an interpretation for recent observations by scanning tunneling microscope ͑STM͒: the superstructure features observed by STM on the H layers is a direct consequence of the atomic displacements in this layer.

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“…Unexpected structural features seen on the pure MnPS3 surface make the images more difficult to interpret than expected from previous AFM or STM studies on the layered dichalcogenides [10,13,34]. As already carried out for other lamellar compounds [14,35,36], calculations of the total electron density distribution is now necessary to analyse these first observations. By comparison with pure MnPS3, the observations of other MPS3 material (with M = Fe, Ni or Cd) surfaces will be considered.…”

Section: )4mentioning

confidence: 97%

Imaging of MnPS3 lamellar material and of Mn1- xPS3K2x(H2O) (x = 0.2) intercalated compound by Atomic Force Microscopy

Lagadic

Clément²

1993

Microsc. Microanal. Microstruct.

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plane is naturally observed, with a S-S distance (3.5 Å) in good agreement with the crystallographic structure. Moreover, we measured an other periodic spacing (6.5 A) which also appears on the images of the potassium intercalate surface. This feature is discussed in terms of structural modifications inside a MnPS3 sheet. The presence of guest species in the interlamellar space could explain this modification. In the case of pure MnPS3, water molecules could be reversibly inserted between the layers, thus disturbing the slab structure.

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Nature of the charge density wave images of layered tantalum dichalcogenides 1T-TaX2 (X = sulfur, selenium) in scanning tunneling and atomic force microscopy

Cited by 33 publications

References 0 publications

The Scanning–Tunneling Microscopy, the X-Ray Photoelectron Spectroscopy, the Inner-Shell-Electron Energy-Loss Spectroscopy Studies ofMTe2andM3SiTe6(M=Nb and Ta)

The Scanning–Tunneling Microscopy, the X-Ray Photoelectron Spectroscopy, the Inner-Shell-Electron Energy-Loss Spectroscopy Studies ofMTe2andM3SiTe6(M=Nb and Ta)

Commensurately modulated structure of4Hb−TaSe2determined by x-ray crystal-structure refinement

Imaging of MnPS3 lamellar material and of Mn1- xPS3K2x(H2O) (x = 0.2) intercalated compound by Atomic Force Microscopy

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