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Author (up) Niebieskikwiat, D.; Silhanek, A.; Civale, L.; Nieva, G.; Levy, P.; Krusin-Elbaum, L. openurl 
  Title Suppression of matching field effects by splay and pinning energy dispersion in YBa2Cu3O7 with columnar defects Type Journal Article
  Year 2001 Publication PHYSICAL REVIEW B Abbreviated Journal  
  Volume 63 Issue 14 Pages 144504  
  Keywords  
  Abstract We report measurements of the irreversible magnetization M-i of a large number of YBa2Cu3O7 single crystals with columnar defects (CD). Some of them exhibit a maximum in M-i when the density of vortices equals the density of tracks, at temperatures above 40 K. We show that the observation of these matching field effects is constrained to those crystals where the orientational and pinning energy dispersion of the CD system lies below a certain threshold. The amount of such dispersion is determined by the mass and energy of the irradiation ions, and by the crystal thickness. Time relaxation measurements show that the matching effects are associated with a reduction of the creep rate, and occur deep into the collective pinning regime.  
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  Series Volume Series Issue Edition  
  ISSN 0163-1829 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000168059800084 Approved no  
  Call Number BT @ hernan @ Serial 217  
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