FAS NEUTRON-IRRADIATION EFFECTS IN YBA2CU4O8 CERAMICS

Authors
WISNIEWSKI A BRANDSTATTER G CZURDA C SAUERZOPF FM WEBER HW MORAWSKI A LADA T
Citation
A. Wisniewski et al., FAS NEUTRON-IRRADIATION EFFECTS IN YBA2CU4O8 CERAMICS, Physica. B, Condensed matter, 194, 1994, pp. 2147-2148
Citations number
3
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
194
Year of publication
1994
Part
2
Pages
2147 - 2148
Database
ISI
SICI code
0921-4526(1994)194:<2147:FNEIYC>2.0.ZU;2-K
Abstract
The influence of fast neutron irradiation on the intragrain critical c urrents density, J(c), and on the position of the irreversibility line in YBa2Cu4O8 (124) ceramics was studied in fields up to 8 T. The high est radiation-induced enhancement of J(c) occurs at comparatively low fluences (< 5.5-10(21) m-2) and shows an unusual temperature dependenc e, namely a maximum at about 40 K. A shift of the irreversibility line to higher fields and temperatures is observed after irradiation. The depinning fields are proportional to (1-T/T(c))alpha. The exponent alp ha decreases after irradiation from 1.76 (unirradiated sample) to 1.49 (at the highest fluence).