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Superconductivity in two-dimensional NbSe2 field effect transistors
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El-Bana, Mohammed S., Wolverson, Daniel, Russo, Saverio, Balakrishnan, Geetha, Paul, Don McK. and Bending, Simon John (2013) Superconductivity in two-dimensional NbSe2 field effect transistors. Superconductor Science and Technology, Volume 26 (Number 12). Article number 125020. doi:10.1088/0953-2048/26/12/125020 ISSN 0953-2048.
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Official URL: http://dx.doi.org/10.1088/0953-2048/26/12/125020
Abstract
We describe investigations of superconductivity in few molecular layer NbSe2 field effect transistors. While devices fabricated from NbSe2 flakes less than eight molecular layers thick did not conduct, thicker flakes were superconducting with an onset Tc that was only slightly depressed from the bulk value for 2H-NbSe2 (7.2 K). The resistance typically showed a small, sharp high temperature transition followed by one or more broader transitions which usually ended in a wide tail to zero resistance at low temperatures. We speculate that these multiple resistive transitions are related to disorder in the layer stacking. The behavior of several flakes has been characterized as a function of temperature, applied field and back-gate voltage. We find that the conductance in the normal state and transition temperature depend weakly on the gate voltage, with both conductivity and Tc decreasing as the electron concentration is increased. The application of a perpendicular magnetic field allows the evolution of different resistive transitions to be tracked and values of the zero temperature upper critical field, Hc2(0), and coherence length, ξ(0), to be independently estimated. Our results are analyzed in terms of available theories for these phenomen
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Superconductivity, Field-effect transistors | ||||
Journal or Publication Title: | Superconductor Science and Technology | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0953-2048 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 26 | ||||
Number: | Number 12 | ||||
Article Number: | Article number 125020 | ||||
DOI: | 10.1088/0953-2048/26/12/125020 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Egypt, Engineering and Physical Sciences Research Council (EPSRC), Jāmiʻat ʻAyn Shams [Ain Shams University] | ||||
Grant number: | EP/G036101/1, MP-1201 (EPSRC); EP/G036101/1, EP/K010050/1, EP/J000396/1 (EPSRC) |
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