Critical current density and flux pinning in Zr0.96V0.04B2 superconductor with AlB2 structure

Autor(es)

Jung, Soon-Gil ^[1] ; Vanacken, J. ^[1] ; Moshchalkov, V. V. ^[1] ; Renosto, S. T. ^[2] ; dos Santos, C. A. M. ^[2] ; Machado, A. J. S. ^[2] ; Fisk, Z. ^[3] ; Albino Aguiar, J. ^[4]

Afiliação do(s) autor(es)

^[1] Katholieke Univ Leuven, INPAC Inst Nanoscale Phys & Chem, B-3001 Louvain - Belgium

^[2] Univ Sao Paulo, Escolade Engn Lorena, Lorena, SP - Brazil

^[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 - USA

^[4] Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 114, n. 13 OCT 7 2013.
• Citações Web of Science: 3

Resumo

We have investigated the critical current density (J(c)) and the flux pinning behavior in Zr0.96V0.04B2 superconductor with an AlB2 structure. V substitutions in Zr sites of non-superconducting ZrB2 system lead to superconductivity, and the 4% V-substituted Zr0.96V0.04B2 compounds show the highest superconducting transition temperature (T-c) of similar to 8.7 K. The magnetic hysteresis (M-H) loops for the Zr0.96V0.04B2 demonstrate type-II superconducting behavior in a broad temperature range, and the J(c) is estimated from the M-H loops using the Bean model. The analysis of the double-logarithmic J(c)(H) plots indicates the dominance of collective pinning in Zr0.96V0.04B2, and that J(c)(H) and magnetic field dependences of the flux pinning force density (F-p) are well fitted by the double exponential model which takes into account the existence of two superconducting gaps. (C) 2013 AIP Publishing LLC. (AU)

• Processo FAPESP: 11/05961-3 - Estudo da supercondutividade em diboretos e dicalcogenios de metais de transição (MeB2 e MeX2), com protótipo AlB2 e suas variações
• Beneficiário: Sérgio Tuan Renosto
• Modalidade de apoio: Bolsas no Brasil - Doutorado