The surface superstructures in niobium disulfide and diselenide intercalated by Cu, Co and Fe

Prodan, A.; Marinković, V.; Rojšek, M.; Jug, N.; Midden, H. J. P. van; Boswell, F.W.; Bennett, J.C.; Böhm, Horst

doi:10.1016/s0039-6028(00)01116-x

Cited by 11 publications

(10 citation statements)

References 19 publications

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“…in the superstructures formed by intercalated metal atoms in the subsurface vdW gaps of NbS 2 and NbSe 2 [46] and in the case of unstable domain boundaries formed along such gaps in the monoclinic NbTe 2 [47]. The observed long-range ordering in NbSe 3 [41] must be of a similar origin, as schematically shown in figure 2a.…”

Section: Discussionmentioning

confidence: 85%

Charge density waves in NbSe3: The models and the experimental evidence

Prodan

Midden

Žitko

et al. 2010

Solid State Communications

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Abstract. Charge density wave (CDW) ordering in the prototypical low-dimensional compound NbSe 3 is reconsidered. We show that the widely accepted CDW model with two incommensurate modulations, q 1 = (0,0.241,0) and q 2 = (0.5,0.260,0.5), localized on type-III and type-I bi-capped trigonal prismatic (BCTP) columns, does not explain some details, revealed by various microscopic methods. The suggested alternative explanation is in a better accord with the entire experimental evidence, including low-temperature (LT) scanning tunneling microscopy (STM) results. It is based on the existence of modulated layered nano-domains formed below both CDW onset temperatures. According to this model, two of the three slightly different BCTP types of columns are modulated by the same wave vector, either q 1 or q 2 , which can easily switch over in a domain as a whole. This approach explains the presence of the q 2 modulation in the STM images recorded above the T 2 CDW transition and the absence of the q 2 satellites in the corresponding diffraction patterns. The long periodic modulation, detected by LT STM is attributed to a beating between the two CDWs, centered on adjacent columns of the same type. These pairs of columns, both either of type-III or type-I, modulated by the two alternative CDWs, represent the basic modulation units, ordered into nano-domains.

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Section: Discussionmentioning

confidence: 85%

Charge density waves in NbSe3: The models and the experimental evidence

Prodan

Midden

Žitko

et al. 2010

Solid State Communications

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“…5(b)), the oxidizing temperature of Pd 0.17 NbSe 2 is 608 K, higher than NbSe 2 (544 K). The enhanced thermostability in air could stem from the intercalated Pd which stabilizes the crystal structure of NbSe 2 by connecting the adjacent Nb-Se layers [11,[21][22] .…”

Section: Resultsmentioning

confidence: 99%

“…In summary, we introduced noble metal Pd into the vdW gaps of NbSe 2 , and synthesized a series of new intercalated compounds Pd x NbSe 2 . The Pd 0.17 NbSe 2 crystalizes in hexagonal structure with cell parameter a= 0.34611(2) nm, c=1.27004 (11) nm. The intercalated Pd stabilizes the crystal structure of NbSe 2 by connecting the adjacent Nb-Se layers with [PdSe 6 ] octahedra leading to the enhanced thermostability in air.…”

Section: Discussionmentioning

confidence: 99%

“…Typically, the incorporation of guest metal atoms into the vdW gaps of TMDs could give rise to the crystallographic transformation and change of electronic structure in the intercalated compounds [10] . Magnetic elements (Fe, Co) inserted into the vdW gaps of NbSe 2 resulted in the formation of superlattice [11][12] . Alkali metal intercalation was found to remove the CDW instability in NbSe 2 [13] .…”

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confidence: 99%

“…shown inTable S2-S3. The space group of Pd 0.17 NbSe 2 is determined to be P6 3 /mmc with lattice parameters of a=0.34611(2) nm, c=1.27004(11) nm. Pd 0.17 NbSe 2 contains one independent Nb site (2b), one independent Se site (4f) and one independent Pd site (2a).…”

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Synthesis, Crystal Structure, and Electrical Conductivity of Pd-intercalated NbSe2

Chong¹,

Zhao²,

Wang³

et al. 2019

Journal of Inorganic Materials

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New intercalated compounds Pd x NbSe 2 (x=0-0.17) were synthesized via solid-state reaction. They possess the parent structure of 2H-NbSe 2 and crystalize in the hexagonal space group of P6 3 /mmc. The intercalated Pd occupies the octahedral position in the van der Waals gaps of 2H-NbSe 2. Unit cell parameter c increases linearly with the Pd content, while a is nearly unchanged. The lattice parameter of Pd 0.17 NbSe 2 (a=b=0.34611(2) nm, c= 1.27004(11) nm) is identified by single crystal X-ray diffraction. The intercalated Pd stabilizes the crystal structure of NbSe 2 by connecting the adjacent Nb-Se layers with [PdSe 6 ] octahedra and leads to the enhanced thermostability in air. Temperature dependence of electric resistivity reveals that the residual resistivity ratio of Pd x NbSe 2 monotonically decreases with addition of the intercalated Pd content. The decreased superconducting critical temperature of Pd x NbSe 2 indicates the suppression effect of Pd intercalation on the superconductivity in the host NbSe 2 .

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