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FIB-deposited carbon-based superconducting nanowires with Tc ˜ 7 K

Published online by Cambridge University Press:  31 January 2011

Pashupati Dhakal ,
Gregory McMahon ,
Liam Norris ,
Jeong Il Oh  and
Michael J. Naughton
Pashupati Dhakal
Affiliation:
[email protected], Boston College, Department of Physics, Chestnut Hill, Massachusetts, United States
Gregory McMahon
Affiliation:
[email protected], Boston College, Physics, Chestnut Hill, Massachusetts, United States
Liam Norris
Affiliation:
[email protected], Boston College, Physics, Chestnut Hill, Massachusetts, United States
Jeong Il Oh
Affiliation:
[email protected], Boston College, Physics, Chestnut Hill, Massachusetts, United States
Michael J. Naughton
Affiliation:
[email protected], Boston College, Physics, Chestnut Hill, Massachusetts, United States
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Abstract

We have fabricated carbon-containing nanowires by a gallium focused ion beam-induced deposition process from the precursor phenanthrene, C14H10. The electrical conductivity of the nanowires is only weakly temperature dependent below 300K, and reveals a superconducting state below Tc ˜ 7 K. We have measured the temperature dependence of the resistive upper critical field Hc2(T), and from those data, estimate the zero temperature critical field and coherence length to be 8.8 T and 6.1 nm, respectively. The Tc of this material is approximately 40% higher than that in any other FIB/direct write nanowire, such as those based on W(Ga), and thus offers the possibility of fabricating superconducting direct-write nanostructures that function at liquid helium temperature.

Keywords

superconductingion-beam processingC
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1206: Symposium M – Multifunction at the Nanoscale through Nanowires , 2009 , 1206-M16-09
Copyright
Copyright © Materials Research Society 2010

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