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Author (up) Durán, C.; Esquinazi, P.; Luzuriaga, J.; Brandt, E.H. doi  openurl
  Title Bc1 of high-Tc La1.8Sr0.2CuO4 and amorphous Zr70Cu30 superconductors measured by a vibrating reed Type Journal Article
  Year 1987 Publication Physics Letters A Abbreviated Journal Phys. Lett. A  
  Volume 123 Issue 9 Pages 485-488  
  Keywords Zr70Cu30; ZIRCONIUM COPPER ALLOYS – Amorphous  
  Abstract The lower critical field Bc1 of the high-Tc superconductor La1.8Sr0.2CuO4 (Tc=40 K, Bcless-than-or-equals, slant7.7 mT) and of amorphous Zr70Cu30 (Tc=2.6K, Bc1less-than-or-equals, slant3.8 mT) is obtained from the resonance frequency ?/2? of a vibrating reed made of these materials. At applied magnetic fields Ba<Bc1, ?(Ba)=?i(Ba) as predicted for an ideally diamagnetic reed. Above Bc1 we observe a reversible linear law ?2??2inot, vert, similarB2a?B2c1. This allows a simple definition of Bc1 even in ceramic superconductors into which flux starts to penetrate at Bamuch less-thanBc1 due to their granular structure.  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0375-9601 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:A1987K407100012 Approved no  
  Call Number BT @ hernan @ Serial 269  
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