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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Controllable morphology of flux avalanches in microstructured superconductors

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Autor(es):
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Motta, M. [1] ; Colauto, F. [1] ; Vestgarden, J. I. [2] ; Fritzsche, J. [3] ; Timmermans, M. [4] ; Cuppens, J. [4] ; Attanasio, C. [5, 6] ; Cirillo, C. [5, 6] ; Moshchalkov, V. V. [4] ; de Vondel, J. Van [4] ; Johansen, T. H. [7, 2] ; Ortiz, W. A. [1] ; Silhanek, A. V. [8]
Número total de Autores: 13
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Paulo - Brazil
[2] Univ Oslo, Dept Phys, N-0316 Oslo - Norway
[3] Chalmers, Dept Appl Phys, S-41296 Gothenburg - Sweden
[4] Katholieke Univ Leuven, Nanoscale Superconduct & Magnetism Grp, Inst Nanoscale Phys & Chem, B-3001 Louvain - Belgium
[5] Univ Salerno, CNR SPIN Salerno, I-84084 Fisciano, Sa - Italy
[6] Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, Sa - Italy
[7] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522 - Australia
[8] Univ Liege, Dept Phys, B-4000 Sart Tilman Par Liege - Belgium
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 89, n. 13 APR 14 2014.
Citações Web of Science: 18
Resumo

The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a treelike structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more difficult experimental access, such as the local values of temperature and electric field. (AU)

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