Phys. Rev. B 55, R4921 - R4924 (1997)Metallic resistivity in crystalline ropes of single-wall carbon nanotubes |
J. E. Fischer1, H. Dai2, A. Thess2, R. Lee1, N. M. Hanjani1, D. L. Dehaas1, and R. E. Smalley2
1Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter,
2Center for Nanoscale Science and Technology, Rice Quantum Institute
Departments of Chemistry and Physics, Rice University, Houston Texas 77251
Laser ablation of (Co,Ni)-doped graphite yields ∼ 70% single-wall nanotubes, predominantly (10,10) armchair tubes which self-organize into crystalline ``ropes''>100 Å in diameter and>10 μm long. We find ρ‖=0.03-0.10mΩ cm at 300 K, with positive (negative) dρ/dT above (below) T = 35 K. Unoriented bulk samples exhibit similar behavior, with higher (directionally averaged) resistivities and T*'s. The high-T behavior is consistent with the predicted intrinsic metallic state for this structure.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v55/pR4921
DOI: 10.1103/PhysRevB.55.R4921
PACS: 72.80.Rj, 72.15.Eb, 72.15.Rn
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