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Author Hernandez,A.; Ares,O.; Hart, C.; Domínguez,D.; Pastoriza,H.; Butera, A. openurl 
  Title Dissipation in mesoscopic superconductors with ac magnetic fields Type Journal Article
  Year 2004 Publication Journal of Low Temperature Physics Abbreviated Journal  
  Volume 135 Issue (up) Pages 119-122  
  Keywords  
  Abstract The response of mesoscopic superconductors to an ac magnetic field is investigated both experimentally

and with numerical simulations. We study small square samples with dimensions of the order of the penetration depth.

We obtain the ac susceptibitity $\chi=\chi'+\chi“$ at microwave frequencies as a function of the dc magnetic field

$H{dc}$. We find that the dissipation, given by $\chi”$, has a non monotonous behavior in mesoscopic samples.

In the numerical simulations we obtain that the dissipation increases before the penetration of vortices and

then it decreases abruptly after vortices have entered, the sample. This is verified experimentally, where we

find that $\chi"$ has strong oscillations as a function of $H
{dc}$ in small squares of Pb
 
  Address  
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  Notes Approved no  
  Call Number BT @ hernan @ hernandez04 Serial 24  
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Author Tovar, M.; Sereni, J.G.; Pedrazzini, P.; Caneiro, A.; Prado, F.; Butera, A.; Causa, M.T. doi  openurl
  Title Magnetization and specific heat of La doped Sr2FeMoO6 Type Journal Article
  Year 2004 Publication JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Abbreviated Journal J. Magn. Magn. Mater.  
  Volume 272 Issue (up) Pages 857-858  
  Keywords  
  Abstract We present high-temperature magnetization and low-temperature specific heat measurements performed on the electron doped double perovskite Sr1.7La0.3FeMoO6. We have obtained the electronic contribution to C-p, gamma = 11.5(5) mJ/mol K-2. The electronic susceptibility, derived from the magnetic measurements in the paramagnetic regime (T > T-c = 390K), was chi(e)(0) =(4.9 +/- 1.5) x 10(-4) emu/mol. Anti ferromagnetic coupling between localized and itinerant moments was inferred from the data, with a coupling constant lambda = -(475 +/- 50)mol/emu, that results in a ferromagnetic-like Curie-Weiss susceptibility with Theta = 390(5) K. These results are compared with those obtained for the undoped material. (C) 2003 Published by Elsevier B.V.  
  Address  
  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0304-8853 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000222236700045 Approved no  
  Call Number BT @ hernan @ Serial 63  
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