Pressure-induced superconductivity in boron-doped Buckypapers

Nakamura, J.; Matsudaira, M.; Haruyama, J.; Sugiura, H.; Tachibana, M.; Reppert, J.; Rao, A.; Nishio, T.; Hasegawa, Y.; Sano, H.; Iye, Y.
October 2009
Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p142503
Academic Journal
We show creation of paperlike thin film (Buckypaper) consisting of pseudo-two-dimensional network of boron-doped single-walled carbon nanotubes (B-SWNTs) within weakly intertube van der Waals coupling (IVDWC) state. It was formed by sufficiently dissolving as-grown ropes of B-SWNTs and densely assembling them on silicon substrate. We find that superconducting transition temperature (Tc) of 8 K under absent pressure can be induced up to 19 K by applying a small pressure to the film and that a frequency in the radial breathing phonon drastically increases with applying pressure. Discussion about IVDWC and distribution of B-SWNTs diameter imply the strong correlation.


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