Artículo
Thickness dependence of the superconducting properties of γ- Mo2N thin films on Si (001) grown by DC sputtering at room temperature
Haberkorn, Nestor Fabian
; Bengió, Silvina
; Troiani, Horacio Esteban
; Suarez, Sergio Gabriel
; Pérez, Pablo Daniel
; Granell, Pablo Nicolás; Golmar, Federico
; Sirena, Martin
; Guimpel, Julio Juan
Fecha de publicación:
01/2018
Editorial:
Elsevier Science Sa
Revista:
Materials Chemistry and Physics
ISSN:
0254-0584
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We study the crystalline structure and superconducting properties of γ-Mo2N thin films grown by reactive DC sputtering on AlN buffered Si (001) substrates. The films were grown at room temperature. The microstructure of the films, which was studied by X-ray diffraction and transmission electron microscopy, shows a single-phase with nanometric grains textured along the (200) direction. The films exhibit highly uniform thickness in areas larger than 20 × 20 μm2. The superconducting critical temperature Tc is suppressed from 6.6 K to ≈ 3.0 K when the thickness decreases from 40 nm to 5 nm. The residual-resistivity ratio is slightly smaller than 1 for all the films, which indicates very short electronic mean free path. The films are in the superconducting dirty limit with upper critical field Hc2 (0) ≈ 12 T for films with thickness of 40 nm, and 9 T for films with thickness of 10 nm. In addition, from the critical current densities Jc in the vortex-free state, we estimate a penetration depth λ(0) ≈ (800 ± 50) nm and a thermodynamic critical field Hc (0) = (500 ± 80 Oe).
Palabras clave:
SUPERCONDUCTIVITY
,
THIN FILMS
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Haberkorn, Nestor Fabian; Bengió, Silvina; Troiani, Horacio Esteban; Suarez, Sergio Gabriel; Pérez, Pablo Daniel; et al.; Thickness dependence of the superconducting properties of γ- Mo2N thin films on Si (001) grown by DC sputtering at room temperature; Elsevier Science Sa; Materials Chemistry and Physics; 204; 1-2018; 48-57
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