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Abstract:

Point-contact Andreev reflection and magnetoresistance measurements were done using amorphous tungsten carbide (WC x) superconductors. Superconducting tips as well as microwires were grown directly under a focused Ga +-ion beam (FIB) on pre-patterned samples. Using ebeam lithography, the electrical contacts were prepared later using a special geometry. Current-voltage measurements as a function of temperature and magnetic field clearly showed the signatures of Andreev reflection. We observed anomalies in the differential conductivity at voltages above the energy gap values. These anomalies can be well understood as due to a weak-link formation with narrow band properties contributing in parallel at the interfaces of the contacts. We also observed Andreev oscillations as a function of magnetic field similar to those found recently in specially prepared normal-superconducting-normal nanostructures and multigraphene samples. In some of the structures, we were able to produce interfaces in which clear granular behavior in a certain temperature region was observed, such as, for example, an anomalous field hysteresis loop compatible with the existence of granular superconductivity, similar to that found also in thin mesoscopic graphite samples. © Springer Science+Business Media, LLC 2010.

Registro:

Documento: Artículo
Título:Andreev reflection and granular superconductivity features observed in mesoscopic samples using amorphous tungsten carbide superconductors
Autor:Barzola-Quiquia, J.; Dusari, S.; Chiliotte, C.; Esquinazi, P.
Filiación:Division of Superconductivity and Magnetism, University of Leipzig, 04013 Leipzig, Germany
Departamento de Fisica, FCEyN, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, Buenos Aires, Argentina
Palabras clave:Andreev oscillations; Focused ion beam; Granular superconductivity; Normal-superconducting nanostructures; Andreev oscillations; Andreev reflection; Carbide superconductors; Current-voltage measurements; Differential conductivity; e-Beam lithography; Electrical contacts; Energy gap values; Granular superconductivity; Magnetoresistance measurements; Mesoscopic graphite; Mesoscopics; Micro wire; Narrow bands; Normal-superconducting nanostructures; Superconducting tips; Temperature regions; Contacts (fluid mechanics); Electric resistance; Ion beams; Magnetic fields; Magnetic materials; Nanostructures; Superconducting materials; Tungsten; Tungsten carbide; Superconductivity
Año:2011
Volumen:24
Número:1-2
Página de inicio:463
Página de fin:469
DOI: http://dx.doi.org/10.1007/s10948-010-0973-8
Título revista:Journal of Superconductivity and Novel Magnetism
Título revista abreviado:J Supercond Novel Magn
ISSN:15571939
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15571939_v24_n1-2_p463_BarzolaQuiquia

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Citas:

---------- APA ----------
Barzola-Quiquia, J., Dusari, S., Chiliotte, C. & Esquinazi, P. (2011) . Andreev reflection and granular superconductivity features observed in mesoscopic samples using amorphous tungsten carbide superconductors. Journal of Superconductivity and Novel Magnetism, 24(1-2), 463-469.
http://dx.doi.org/10.1007/s10948-010-0973-8
---------- CHICAGO ----------
Barzola-Quiquia, J., Dusari, S., Chiliotte, C., Esquinazi, P. "Andreev reflection and granular superconductivity features observed in mesoscopic samples using amorphous tungsten carbide superconductors" . Journal of Superconductivity and Novel Magnetism 24, no. 1-2 (2011) : 463-469.
http://dx.doi.org/10.1007/s10948-010-0973-8
---------- MLA ----------
Barzola-Quiquia, J., Dusari, S., Chiliotte, C., Esquinazi, P. "Andreev reflection and granular superconductivity features observed in mesoscopic samples using amorphous tungsten carbide superconductors" . Journal of Superconductivity and Novel Magnetism, vol. 24, no. 1-2, 2011, pp. 463-469.
http://dx.doi.org/10.1007/s10948-010-0973-8
---------- VANCOUVER ----------
Barzola-Quiquia, J., Dusari, S., Chiliotte, C., Esquinazi, P. Andreev reflection and granular superconductivity features observed in mesoscopic samples using amorphous tungsten carbide superconductors. J Supercond Novel Magn. 2011;24(1-2):463-469.
http://dx.doi.org/10.1007/s10948-010-0973-8