The Instability of the NbTe2 Surface Structure

Cukjati, D.; Prodan, A.; Jug, N.; Midden, H. J. P. van; Hla, Saw‐Wai; Böhm, Horst; Boswell, F.W.; Bennett, J.C.

doi:10.1002/1521-396x(200209)193:2<246::aid-pssa246>3.0.co;2-g

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…2c) reveals a (3 × 1) surface unit cell, confirming the experimental finding. The presence of additional spots were already reported earlier [37] and correctly interpreted as a superposition of patterns from three domains. However, the appearance of these superspots has not been recognized as a (3 × 1) surface superstructure.…”

Section: Experiments and Calculationsupporting

confidence: 80%

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Fermi-surface-induced lattice distortion inNbTe2

Battaglia¹,

Cercellier²,

Clerc³

et al. 2005

Phys. Rev. B

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The origin of the monoclinic distortion and domain formation in the quasi two-dimensional layer compound NbTe2 is investigated. Angle-resolved photoemission shows that the Fermi surface is pseudogapped over large portions of the Brillouin zone. Ab initio calculation of the electron and phonon bandstructure as well as the static RPA susceptibility lead us to conclude that Fermi surface nesting and electron-phonon coupling play a key role in the lowering of the crystal symmetry and in the formation of the charge density wave phase.

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Section: Experiments and Calculationsupporting

confidence: 80%

“…1). The diffuse nature of the LEED pattern has been explained in terms of thermal disorder [37]. Our LEED measurements at low temperature remain diffuse.…”

Section: Resultsmentioning

confidence: 85%

Fermi-surface-induced lattice distortion inNbTe2

Battaglia¹,

Cercellier²,

Clerc³

et al. 2005

Phys. Rev. B

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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: 99%

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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