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Shift of the surface-barrier part of the irreversibility line due to columnar defects in Bi_2Sr_2CaCu_2O_8 thin films

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arxiv cond-mat/0309530 v1 pith:XUIEHY2K submitted 2003-09-23 cond-mat.supr-con

Yu. Talanov (1) , H.Adrian (2) , M.Basset (2) , G.Jakob (2) , G.Wirth (3) ((1) Zavoisky Physical-Technical Institute , Kazan , Russia , (2) Johannes Gutenberg-Universitat
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Institut fuer Physik Mainz Germany (3) Gesellschaft fuer Schwerionenforschung Darmstadt Germany)
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classification cond-mat.supr-con
keywords filmsirreversibilitylinecacucolumnardefectspartresults
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We report the results of studying the influence of the uranium-ion irradiation of the Bi_2Sr_2CaCu_2O_8 thin films on the high-temperature part (close to critical temperature) of their irreversibility line. We studied irreversible properties of the films by measuring the hysteresis of nonresonant microwave absorption. The results have revealed the shift of irreversibility line towards low temperatures and magnetic fields. The effect is most significant for the films irradiated with large doses, more than 1T. This fact is in good agreement with the theoretical prediction by Koshelev and Vinokur of suppression of surface barrier by columnar defects.

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