Imaging Flux Avalanches in V3Si Superconducting Thin Films

Autor(es)

Leite Gusmao Pinheiro, Lincoln Brum ^{[1, 2]} ; Motta, Maycon ^[1] ; Colauto, Fabian ^[1] ; Johansen, Tom H. ^[3] ; Bellingeri, Emilio ^[4] ; Bernini, Cristina ^[4] ; Ferdeghini, Carlo ^[4] ; Ortiz, Wilson A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

^[2] Inst Fed Sao Paulo, Campus Sao Carlos, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Oslo, Dept Phys, N-0316 Oslo - Norway

^[4] CNR SPIN, I-16152 Genoa - Italy

• Tipo de documento: Artigo Científico
• Fonte: IEEE Transactions on Applied Superconductivity; v. 29, n. 5 AUG 2019.
• Citações Web of Science: 0

Resumo

When developing superconducting devices patterned on thin films, one should bear in mind that flux avalanches might occur for some materials at a certain window of applied fields and temperatures. Although the A15 superconductors are well known and used in a variety of purposes, there are no studies about flux avalanches in V3Si thin films. In the present work, we report the observation of flux avalanches in films of V3Si, grown by pulsed laser deposition on a LaAlO3 substrate. The range of temperatures and applied magnetic fields at which the avalanches take place is determined using dc-magnetometry. Magneto-Optical Imaging is employed to visualize the occurrence and spatial distribution of such flux avalanches. Images of the flux penetrated into the samples indicate a clear anisotropic distribution, which is ascribed to a thickness gradient. The observation of flux avalanches reported here implies that attention to this feature must be given when films of V3Si are envisaged for possible applications. (AU)

• Processo FAPESP: 17/24786-4 - Matéria de vórtice em filmes supercondutores com anisotropia ajustável
• Beneficiário: Fabiano Colauto
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/08072-0 - Pesquisa fundamental em supercondutividade e magnetismo - sistemas com potencial para aplicações: óxidos avançados e supercondutores dotados de estruturas artificiais
• Beneficiário: Wilson Aires Ortiz
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/16193-6 - Applied Superconductivity Conference - ASC 2018
• Beneficiário: Maycon Motta
• Linha de fomento: Auxílio à Pesquisa - Reunião - Exterior