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Title: Critical currents, pinning forces and irreversibility fields in (YxTm1-x)Ba2Cu3O7 single crystals with columnar defects in fields up to 50 T
Authors: Trappeniers, Lieven
Vanacken, Johan
Weckhuysen, Liesbet
Rosseel, Kris
Didyk, AY
Goncharov, IN
Leonyuk, LI
Boon, Willy
Herlach, Fritz
Moshchalkov, Victor
Bruynseraede, Yvan #
Issue Date: Feb-1999
Publisher: Elsevier science bv
Series Title: Physica C vol:313 issue:1-2 pages:1-10
Abstract: We have studied the influence of columnar defects, created by heavy-ion (Kr) irradiation with doses up to 6 x 10(11) Kr-ions/cm(2), on the superconducting critical parameters of single crystalline (YxTm1-x)Ba2Cu3O7. Magnetisation measurements in pulsed fields up to 50 T in the temperature range 4.2-90 K revealed that: (i) in fields up to mu(0) H approximate to 20 T the critical current J(c)(H,T) is considerably enhanced and (ii) down to temperatures T similar to 40 K the irreversibility field H-irr(T) is strongly increased. The field range and magnitude of the J(c)(H,T) and H-irr(T) enhancement increase with increasing irradiation dose. To interpret these observations, an effective matching field B phi. was defined. Moreover, introducing columnar defects also changes the pinning force f(p) qualitatively. Due to stronger pinning of flux lines by the amorphous defects, the superconducting critical parameters largely exceed those associated with the defect structures in the unirradiated as-grown material: J(c,6x10)(11) (2)(Kr-ions / cm)(77 K, 5 T) greater than or equal to 10 J(c,ref) (77 K, 5 T). (C) 1999 Published by Elsevier Science B.V. All rights reserved.
ISSN: 0921-4534
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
# (joint) last author

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