Critical current modulation induced by an electric field in superconducting tungsten-carbon nanowires

Orus, P ; Fomin, VM ; De Teresa, JM (Universidad de Zaragoza) ; Cordoba, R

Resumen: The critical current of a superconducting nanostructure can be suppressed by applying an electric field in its vicinity. This phenomenon is investigated throughout the fabrication and electrical characterization of superconducting tungsten-carbon (W-C) nanostructures grown by Ga+ focused ion beam induced deposition (FIBID). In a 45 nm-wide, 2.7 mu m-long W-C nanowire, an increasing side-gate voltage is found to progressively reduce the critical current of the device, down to a full suppression of the superconducting state below its critical temperature. This modulation is accounted for by the squeezing of the superconducting current by the electric field within a theoretical model based on the Ginzburg-Landau theory, in agreement with experimental data. Compared to electron beam lithography or sputtering, the single-step FIBID approach provides with enhanced patterning flexibility and yields nanodevices with figures of merit comparable to those retrieved in other superconducting materials, including Ti, Nb, and Al. Exhibiting a higher critical temperature than most of other superconductors, in which this phenomenon has been observed, as well as a reduced critical value of the gate voltage required to fully suppress superconductivity, W-C deposits are strong candidates for the fabrication of nanodevices based on the electric field-induced superconductivity modulation.

Idioma: Inglés

DOI: 10.1038/s41598-021-97075-z

Año: 2021

Publicado en: Scientific reports (Nature Publishing Group) 11, 1 (2021), 17698 [9 pp.]
ISSN: 2045-2322

Factor impacto JCR: 4.997 (2021)

Categ. JCR: MULTIDISCIPLINARY SCIENCES rank: 19 / 74 = 0.257 (2021) - Q2 - T1

Factor impacto SCIMAGO: 1.005 - Multidisciplinary (Q1)

Financiación: info:eu-repo/grantAgreement/EUR/COST-Action/CA16218-Nanocohybri
Financiación: info:eu-repo/grantAgreement/ES/CSIC/PIE-202060E187
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/E13-20R
Financiación: info:eu-repo/grantAgreement/EC/H2020/892427/EU/Focused Ion Beam fabrication of superconducting scanning Probes/FIBsuperProbes
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-82970-C2-2-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2018-102627-T

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)