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Author (up) Rodriguez, D.S.; Rodriguez, E.; Luzuriaga, J.; Waszczak, J.V.; Cheong, S.W. doi  openurl
  Title Role of anisotropy in the vortex lattice of superconductors high-Q oscillator measurements in 2H-NbSe2 and La1.825Sr.075CuO4 Type Journal Article
  Year 1994 Publication Physica C Abbreviated Journal  
  Volume 229 Issue 1-2 Pages 59-64  
  Keywords  
  Abstract Measurements of the response of the flux-line lattice in NbSe2 and La1.825Sr0.075CuO4 show important differences between these two materials. In particular, we have studied the magnetic-field and angular dependence of the response of a high-Q mechanical oscillator in fields of up to 1 T. The features seen in NbSe2 seem to be well explained in terms of a change in the pinning regime, usually termed the ''peak effect'' in the critical current, using the collective-pinning model of Larkin and Ovchivnikov within Ginzburg-Landau anisotropic theory. On the other hand the behavior found in the high-T(c) material LSCO seems to fall naturally into a description which takes into account the possibility of phase transitions in the vortex lattice and the quasi-two-dimensional character of the superconductivity.  
  Address  
  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 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:A1994PF49500008 Approved no  
  Call Number BT @ hernan @ Serial 252  
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Author (up) Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodríguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V. url  doi
openurl 
  Title Logarithmic to nonlogarithmic flux creep transition and magnetic flux hardening in BiSrCaCuO superconducting ceramics Type Journal Article
  Year 1989 Publication Physica C: Superconductivity Abbreviated Journal  
  Volume 162-164, Part 1 Issue Pages 665-666  
  Keywords  
  Abstract A sharp temperature and field dependent transition from a logarithmic to a non-logarithmic flux creep behavior has been found in BiSrCaCuO superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed.  
  Address  
  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 0921-4534 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ jguimpel @ Serial 626  
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Author (up) Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodriguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V. url  doi
openurl 
  Title Logarithmic-to-nonlogarithmic flux-creep transition and magnetic-flux hardening in Bi-Sr-Ca-Cu-O superconducting ceramics Type Journal Article
  Year 1989 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 40 Issue 10 Pages 7380  
  Keywords  
  Abstract A sharp temperature- and field-dependent transition from a logarithmic to a nonlogarithmic flux-creep behavior has been found in Bi-Sr-Ca-Cu-O superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating-reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed.  
  Address  
  Corporate Author Thesis  
  Publisher American Physical Society Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ jguimpel @ 10.1103/PhysRevB.40.7380 Serial 627  
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Author (up) Safar, H.; Pastoriza, H.; Cruz, F. de la; Bishop, D.J.; Schneemeyer, L.F.; Waszczak, J.V. url  openurl
  Title Bulk phase transition in YBa$2$Cu$3$O7-δ single crystals Type Journal Article
  Year 1991 Publication Phys. Rev. B Abbreviated Journal  
  Volume 43 Issue 16 Pages 13610-13613  
  Keywords  
  Abstract Precise magnetization measurements of YBa$2$Cu$3$O7-δ single crystals have found evidence for a bulk phase transition a few degrees below the superconducting critical temperature. The phase transition is indicated by a sudden drop of the lower critical field , $H_C1(T)$, separating a full coherent state at low fields and temperatures, the Meissner state, from a region at higher temperatures where magnetic excitations are induced at $H=0$.  
  Address  
  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 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ safar91 Serial 41  
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Author (up) Safar, H.; Pastoriza, H.; Guimpel, J.; Cruz, F. de la; Bishop, D.J.; Schneemeyer, L.F.; Waszczak, J.V. openurl 
  Title Breakdown of the Meissner state in YBa$2$Cu$3$O7-? Type Conference Article
  Year 1990 Publication Transport properties of superconductors Abbreviated Journal  
  Volume Issue Pages 140  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher World Scientific Place of Publication Singapore Editor Nicolsky, R.  
  Language Summary Language Original Title  
  Series Editor Series Title Progress in High Temperature Superconductivity Abbreviated Series Title  
  Series Volume 25 Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ safar90 Serial 40  
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