Electronic structure and charge density wave state in polytypes of NbSe2

Kikuchi, Akihito; Tsuneyuki, Shinji

doi:10.1016/s0039-6028(98)00251-9

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…Also, the new CDW appearing on each Se layer suggests that this is a 1T phase of the NbSe 2 instead of the 4Hb phase as proposed by Komori et al [7]. This is consistent with theoretical calculations [12]. Here we propose a 3D structural transition from 2H to 1T in the area affected by the tip-sample interaction.…”

Section: Defect Structure and The New Modulationsupporting

confidence: 92%

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe₂

Wang¹,

Lee²,

Dreyer³

et al. 2009

J. Phys.: Condens. Matter

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A low temperature scanning tunneling microscope (LT-STM) was used to investigate a new superstructure on the cleaved surface of a 2H- NbSe(2) single crystal after introduction of structural defects through bias voltage pulses during tunneling at 4.2 K. A charge density wave (CDW) with a [Formula: see text] reconstruction was observed in the vicinity of the defects and the well-known 3 × 3 CDW was observed far from these defects. Multiple layers inside the defects were also exposed and showed the new modulation of the CDW on all of the Se layers. This indicates a local 2H to 1T phase transition for the NbSe(2) crystal structure. Two other interesting observations are also included: a disordered CDW-like phase of the [Formula: see text] structure near the atomic steps and an anomalous distortion in the underlying atomic lattice revealed by STM images. A local heating mechanism is proposed to explain the creation of these novel structures.

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Section: Defect Structure and The New Modulationsupporting

confidence: 92%

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe₂

Wang¹,

Lee²,

Dreyer³

et al. 2009

J. Phys.: Condens. Matter

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“…Niobium and tantalum chalcogenides are representative charge density wave materials [57][58][59][60]. Some crystals keep their layered structure upon doping by a host of elements, including Fe, Co and Ni [61].…”

Section: Ternary Sulfide-feta 3 Smentioning

confidence: 99%

Atmospheric pressure chemical vapour deposition synthesis of sulfides, oxides, silicides and metal nanowires with metal chloride precursors

Zhang

Wang

et al. 2006

Nanotechnology

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This account briefly summarizes our research on the synthesis of nanocrystals of a host of materials from metal chloride precursors via atmospheric pressure chemical vapour deposition (APCVD). Successful synthesis of nanocrystals of various sulfides, oxides, silicides, and metals, demonstrates metal chlorides as useful precursors for nanoscience and nanotechnology. Oxide-assisted growth (OAG) is found to dominate the formation of a lot of metal sulfide nanowire/nanosheets. Our hypotheses of geometrically kinetic competition for the interaction between the silica sheath and the inner core materials (hexagonal Fe7S8 and face-centred cubic Cu7.2S4) have fairly well explained the phenomena of silica vapour pressure-dependent growth of the sulfide crystals. But experimental results for some sulfides call for ab initio analysis to determine its effective region associated with torsions.

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“…4 Different polytypes of the TX 2 compounds result in different transport properties. 11,12 For example, 2H-NbSe 2 superconducts below a transition temperature of 7.2 K, while the 3R-phase does not have a superconducting transition. 7 Wiegers et al have attributed different stacking sequences of NbX 2 in misfit layer compounds to different physical properties.…”

Section: ■ Introductionmentioning

confidence: 99%

“…TMDs containing transition metals V and Ti have been reported to have only one type of stacking sequence: 1 T , , while TMDs of Nb, Mo, W, and Ta exhibit polytypism: 1 T , 2 H(H a ) , 2 H b 3 R , 4 H , 4 H dI , and 4 H dII (see Figure ) . Different polytypes of the TX 2 compounds result in different transport properties. , For example, 2 H -NbSe 2 superconducts below a transition temperature of 7.2 K, while the 3 R- phase does not have a superconducting transition . Wiegers et al have attributed different stacking sequences of NbX 2 in misfit layer compounds to different physical properties .…”

Section: Introductionmentioning

confidence: 99%

Effect of Local Structure of NbSe₂ on the Transport Properties of ([SnSe]_1.16)₁(NbSe₂)_n Ferecrystals

Alemayehu

Falmbigl

et al. 2015

Chem. Mater.

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([SnSe]1.16)1(NbSe2) n ferecrystals were synthesized through the modulated elemental reactants technique by increasing the number of Nb|Se layers in the precursor from 1 to 4. The c-lattice parameter of the intergrowth was observed to change as a function of n by 0.635(2) nm. The c-lattice parameter of SnSe was observed to be 0.588(8) nm and independent of n. The electrical resistivity does not decrease as n increases as expected from simple models, but instead the trend in the resistivity is (1,3) > (1,4) ≥ (1,1) > (1,2). The carrier concentration increases with n as expected, so the unusual trend in resistivity is a result of the carrier mobility decreasing with increasing n. In-plane X-ray diffraction line widths and STEM images of the (1,4) compound show that it has small in-plane grain sizes and a large diversity of stacking sequences respectively, providing a potential explanation for the reduced carrier mobility.

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Electronic structure and charge density wave state in polytypes of NbSe2

Cited by 6 publications

References 10 publications

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe₂

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe₂

Atmospheric pressure chemical vapour deposition synthesis of sulfides, oxides, silicides and metal nanowires with metal chloride precursors

Effect of Local Structure of NbSe₂ on the Transport Properties of ([SnSe]_1.16)₁(NbSe₂)_n Ferecrystals

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Electronic structure and charge density wave state in polytypes of NbSe2

Cited by 6 publications

References 10 publications

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe2

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe2

Atmospheric pressure chemical vapour deposition synthesis of sulfides, oxides, silicides and metal nanowires with metal chloride precursors

Effect of Local Structure of NbSe2 on the Transport Properties of ([SnSe]1.16)1(NbSe2)n Ferecrystals

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A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe₂

A scanning tunneling microscopy study of a new superstructure around defects created by tip–sample interaction on 2H- NbSe₂

Effect of Local Structure of NbSe₂ on the Transport Properties of ([SnSe]_1.16)₁(NbSe₂)_n Ferecrystals