Navegação Ciências Exatas e da Terra por Assunto "Nióbio"
Resultados 1-7 de 7
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Anisotropic thermomagnetic avalanche activity in field-cooled superconducting films
(2017) [Artigo de periódico]The electrodynamic behavior of isotropic superconducting Nb films cooled below their critical temperature in the presence of in-plane applied magnetic fields is investigated using magneto-optical imaging. A specially ... -
Cascade dynamics of thermomagnetic avalanches in superconducting films with holes
(2015) [Artigo de periódico]The submicrosecond dynamics of thermomagnetic avalanches in superconducting films with nonconducting holes (antidots) is considered.When such an avalanche reaches a hole, it is quickly filled with magnetic flux, and often ... -
Crossing fields in thin films of isotropic superconductors
(2016) [Artigo de periódico]We study interactions of perpendicular and longitudinal magnetic fields in niobium films of different thickness in a wide range of temperatures below the superconducting transition temperature (TC). In 100-nm Nb film at ... -
Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field
(2021) [Artigo de periódico]Quantitative magneto-optical imaging of a type-II superconductor thin film cooled under zero, homogeneous, and inhomogeneous applied magnetic fields indicates that the latter procedure leads to an enhancement of the screening ... -
Limiting thermomagnetic avalanches in superconducting films by stop-holes
(2013) [Artigo de periódico]It is demonstrated that circular holes in superconducting films of Nb can arrest the propagation of thermomagnetic avalanches. The effect was found over a range of temperatures where the material is susceptible to this ... -
Silica-alumina-niobia (SiO2/Al2O3/Nb2O5) matrix obtained by the sol-gel processing method: new material for online extraction of zonc ions
(2010) [Artigo de periódico]No presente trabalho foi avaliado um novo material como adsorvente, SiO2/Al2O3/Nb2O5 (designado SiAlNb), empregado na determinação e pré-concentração online de Zn2+ por um método espectrofotométrico por injeção em fluxo. ... -
Superconducting properties and electron scattering mechanisms in a Nb film with a single weak-link excavated by focused ion beam
(2021) [Artigo de periódico]Granularity is one of the main features restricting the maximum current which a superconductor can carry without losses, persisting as an important research topic when applications are concerned. To directly observe its ...