Novel nanotubes and encapsulated nanowires

Terrones, Mauricio; Hsu, Wen Kuang; Schilder, A.; Terrones, Humberto; Grobert, Nicole; Hare, Jonathon; Zhu, Yan; Schwoerer, M.; Prassides, Kosmas; Kroto, Harold W.; Walton, D. R. M.

doi:10.1007/s003390050671

Cited by 160 publications

(91 citation statements)

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“…Fitting the Murnaghan equation of state [34] to the total energies versus lattice volume yields the equilibrium lattice constant (a eq = 4.42Å), the bulk modulus (B 0 = 369.83 GPa) and the pressure derivative of the bulk modulus (B = 4.58). When the equilibrium lattice constant is compared to the experimental value (a = 4.456Å) [4,35], we find that our calculated result is rather close to the experimental value.…”

Section: Resultssupporting

confidence: 80%

Electronic structure and optical properties of TaC from the first principles calculation

et al. 2005

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Abstract. The electronic and optical properties of tantalum carbide TaC have been calculated using the full-potential linearized augmented-plane-wave method within the local density approximation scheme for the exchange-correlation potential. We find that the optical spectra can be extremely sensitive to the Brillouin zone sampling. The influence of relativistic effects on the dielectric function is investigated. It is shown that the scalar-relativistic correction is much more important than spin-orbit coupling. Our results are found to be in good agreement with the available experimental data. The determinant role of a band structure computation with respect to the analysis of optical properties is discussed. PACS

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Section: Resultssupporting

confidence: 80%

Electronic structure and optical properties of TaC from the first principles calculation

et al. 2005

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“…We note that the superconducting phase between T cu and T cl in Ta 2 S 2 C is similar to that observed in bulk TaC, 4,5 TaC nanoparticles based on carbon nanotube, 19 TaC encapsulated into the inner core of carbon nanotubes, 20 and Ta-metal graphite based on natural graphite.…”

supporting

confidence: 72%

“…19 (iii) The ZFC and FC susceptibility measurements on TaC crystal encapsulated into the inner core of carbon nanotubes, 20 reveal that this system exhibits a superconductivity below 10 K. The resistivity ρ shows a metallic behavior for T >60 K. The T dependence of ρ for 13 < T < 60 K is well described by a 3D variable range hopping model; ln(ρ/T 1/2 ) is proportional to 1/T 1/4 . (iv) In Ta-metal graphite, Ta metal layer is sandwiched between adjacent graphene sheets, forming a periodic stacking sequence along the c axis.…”

mentioning

confidence: 94%

Successive superconducting transitions inTa2S2Cstudied by electrical resistivity and nonlinear ac magnetic susceptibility

Suzuki

Noji

et al. 2007

Phys. Rev. B

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Ta2S2C compound undergoes superconducting transitions at T cl = 3.60 ± 0.02 K and Tcu = 9.0 ± 0.2 K. The nature of successive superconducting transitions has been studied from electrical resistivity, linear and nonlinear AC magnetic susceptibilities. The resistivity ρ at H = 0 shows a local maximum near Tcu, a kink-like behavior around T cl , and reduces to zero at below T0 = 2.1 K. The ln T dependence of ρ is observed at H = 50 kOe at low temperatures, which is due to two-dimensional weak-localization effect. Below Tcu a two-dimensional superconducting phase occurs in each TaC layer. The linear and nonlinear susceptibilities χ

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“…Indeed, transport measurements [7,8,9] have shown a clearly enhanced conductivity of B-doped tubes. The metallic behavior of B-doped multiwall carbon nanotubes was also confirmed by scanning tunneling spectroscopy [10].…”

Section: Introductionmentioning

confidence: 99%

Band structure of boron doped carbon nanotubes

Wirtz

Rubio²

2003

AIP Conference Proceedings

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Abstract. We present ab initio and self-consistent tight-binding calculations on the band structure of single wall semiconducting carbon nanotubes with high degrees (up to 25 %) of boron substitution. Besides a lowering of the Fermi energy into the valence band, a regular, periodic distribution of the p-dopants leads to the formation of a dispersive "acceptor"-like band in the band gap of the undoped tube. This comes from the superposition of acceptor levels at the boron atoms with the delocalized carbon π-orbitals. Irregular (random) boron-doping leads to a high concentration of hybrids of acceptor and unoccupied carbon states above the Fermi edge.

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Novel nanotubes and encapsulated nanowires

Cited by 160 publications

References 0 publications

Electronic structure and optical properties of TaC from the first principles calculation

Electronic structure and optical properties of TaC from the first principles calculation

Successive superconducting transitions inTa2S2Cstudied by electrical resistivity and nonlinear ac magnetic susceptibility

Band structure of boron doped carbon nanotubes

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