Pressure-induced superconductivity and phonon frequency in paperlike thin films of boron-doped carbon nanotubes
M. Matsudaira, J. Haruyama, H. Sugiura, M. Tachibana, J. Reppert, A. Rao, T. Nishio, Y. Hasegawa, H. Sano, Y. Iye
DOI 10.1103/PhysRevB.82.045402 · Physical Review B
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Abstract
We show formation of paperlike thin films (Buckypaper) consisting of pseudo-two-dimensional network of individual boron-doped single-walled carbon nanotubes (B-SWNTs), by sufficiently dissolving as-grown ropes of SWNTs and densely assembling them on silicon substrate. We find superconducting transition at temperature (Tc) of 8 K under absent pressure and that it can be induced as large as 2.4 times up to 19 K by applying a small pressure of 20 MPa. A significant frequency increase in the radial breathing phonon mode (RBM) is also found with applying pressure in Raman spectrum measurements. Moreover, B-SWNTs with a diameter of 0.6 nm are confirmed in the Buckypaper. These imply the strong correlation of the pressure-induced Tc with electron-phonon (RBM) coupling of 0.6-nm-diameter B-SWNTs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| B-SWNTs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | onset |
| B-SWNTs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | 0.02 GPa | onset |
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