Injection of Cooper pairs into quasidiffusive multiwalled carbon nanotubes with weak localization
J. Haruyama, K. Takazawa, S. Miyadai, A. Takeda, N. Hori, I. Takesue, Y. Kanda, N. Sugiyama, T. Akazaki, H. Takayanagi
DOI 10.1103/PhysRevB.68.165420 · Physical Review B
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Abstract
We study the influence of Cooper pair injection into niobium (Nb)/quasidiffusive multiwalled carbon nanotube (MWNT’s)/aluminum (Al) junctions possessing weak localization. Evaporation of the Nb electrode on the open top end of MWNT’s standing in nanopores of alumina membranes makes end-bonded structures possible, leading to highly transparent Nb/MWNT interfaces. We found a proximity-induced conductance increase (PIC), which was enhanced by the extremely large diffusion constant of the Cooper pair in the MWNT’s, with onset temperatures as high as T=6–9K. In contrast, we clarified that this PIC was very sensitive to the transparency of the MWNT/Al interface at low temperatures. High transparency led to reentrant conductance due to diffusion out of the Cooper pairs, while we successfully found superconductivity at T=0.6K, implying enhanced critical magnetic fields, in some of the low-transparency samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
| NbC Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
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