Superconducting properties in tantalum decorated three-dimensional graphene and carbon structures

Journal Article · Mon Aug 04 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4892574· OSTI ID:22314520

Cobaleda, Cayetano S. F., ^[1]; Xiao, Xiaoyin; Burckel, D. Bruce; Polsky, Ronen; Huang, Duanni ^[1]; Diez, Enrique ^[2]

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1. Sandia National Laboratories, P.O. Box 5800, MS 1086, Albuquerque, New Mexico 87185 (United States)
2. Laboratorio de Bajas Temperaturas, Universidad de Salamanca, E-37008 Salamanca (Spain)

We present here the results on superconducting properties in tantalum thin films (100 nm thick) deposited on three-dimensional graphene (3DG) and carbon structures. A superconducting transition is observed in both composite thin films with a superconducting transition temperature of 1.2 K and 1.0 K, respectively. We have further measured the magnetoresistance at various temperatures and differential resistance dV/dI at different magnetic fields in these two composite thin films. In both samples, a much large critical magnetic field (∼2 T) is observed and this critical magnetic field shows linear temperature dependence. Finally, an anomalously large cooling effect was observed in the differential resistance measurements in our 3DG-tantalum device when the sample turns superconducting. Our results may have important implications in flexible superconducting electronic device applications.

• OSTI ID: 22314520
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GRAPHENE
MAGNETIC FIELDS
MAGNETORESISTANCE
SUPERCONDUCTORS
TANTALUM
THIN FILMS
THREE-DIMENSIONAL CALCULATIONS