scholarly journals Organometalliclike localization of4d-derived spins in an inorganic conducting niobium suboxide

2015 ◽  
Vol 91 (19) ◽  
Author(s):  
K.-W. Lee ◽  
W. E. Pickett
Keyword(s):  
Niobium Suboxide

Structure and Manufacturing Process of MnO2 Counter Electrode in Niobium Suboxide Capacitors

2013 ◽  
Vol 42 (10) ◽  
pp. 2933-2939
Author(s):  
Liqin Chen ◽  
Bo Li ◽  
Zhaoxiong Qi ◽  
Hai Guo ◽  
Ji Zhou ◽  
...  
Keyword(s):  
Manufacturing Process ◽  
Counter Electrode ◽  
Niobium Suboxide

The effect of epitaxy on the upper critical fields of evaporated niobium films

1989 ◽  
Vol 4 (2) ◽  
pp. 283-287 ◽  
Author(s):  
Gin-ichiro Oya ◽  
Tetsuro Komukai ◽  
Yasuji Sawada
Keyword(s):  
Single Crystal ◽  
Critical Field ◽  
Surface Effect ◽  
Upper Critical Field ◽  
Critical Fields ◽  
Surface Nucleation ◽  
Single Crystal Films ◽  
Crystal Films ◽  
Upper Critical Fields ◽  
Niobium Suboxide

Two upper critical fields normal (Bc2⊥) and parallel (Bc2∥) to the surfaces of both single-crystal and polycrystalline Nb films are studied at 4.2 K in relation to the purity and morphology of the films, in order to make properties of the single-crystal films clear. High-quality single-crystal Nb films (with transition temperature Tc of ∼9.3 K and normal resistivity ρn of ∼0.2 μΩ · cm) are found to have magnetic properties characterized by Bc2⊥ of 0.31 T as low as Bc2 (bulk upper critical field) of bulk Nb, and Bc2∥/Bc2⊥ of ∼1.85 as high as Bc3/Bc2 (where Bc3 is the surface nucleation critical field) of pure Nb. These properties depend strongly on high purity and surface smoothness of the films, which is naturally accompanied by superconductivity. Polycrystalline Nb films have higher Bc2⊥ and lower Bc2∥/Bc2⊥, which result from a decrease in purity of the films and a presence of normal-conducting niobium-suboxide layers at the surfaces of the films, and thereby a decrease of the surface effect in the films.

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