AC RESPONSE OF THE VORTEX SYSTEM IN A PR1.85CE0.15CUO4-Y SINGLE-CRYSTAL

Authors
FABREGA L FONTCUBERTA J PINOL S VANDERBEEK CJ KES PH
Citation
L. Fabrega et al., AC RESPONSE OF THE VORTEX SYSTEM IN A PR1.85CE0.15CUO4-Y SINGLE-CRYSTAL, Physical review. B, Condensed matter, 47(22), 1993, pp. 15250-15255
Citations number
34
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
47
Issue
22
Year of publication
1993
Pages
15250 - 15255
Database
ISI
SICI code
0163-1829(1993)47:22<15250:AROTVS>2.0.ZU;2-8
Abstract
We have studied the field, frequency, and amplitude dependence of the ac susceptibility on a single crystal of the electron-doped supercondu ctor Pr1.85Ce0.15CuO4-y. We show that a thermally activated flux motio n over effective energy barriers U(T,H) = U0(1 - T/T(c))H-0.6, with U0 almost-equal-to 40 meV, can account for the dc-field and frequency ef fects. The amplitude dependence of the ac response in this superconduc ting system is discussed and it is argued that it is a signature of th e critical state.