Author:
Ackermann Kai,Mai Vadim,Hänisch Jens,Holzapfel Bernhard
Abstract
Abstract
A pristine YBa2Cu3O6+δ
film as well as two Zn-doped YBa2(Cu1−x
Zn
x
)3O6+δ
films with doping levels x of 0.2 % and 0.4 %, respectively, grown epitaxially on SrTiO3 single crystalline substrates by pulsed laser deposition, were investigated regarding the effect of the doping on the glass-liquid transition line and the pinning potential distribution. Zn doping did not show any effect on the shape of the transition line but caused a suppression of the transition temperature T
GL of about 16 K%−1. Although the doping did not lead to an additional pinning effect, the increase of the critical current density j
c towards lower temperatures is mainly driven by the variation of the threshold critical current density, j
cm. The width of the critical current density distribution j
0 saturates at low temperatures and only drops above ~ 0.9T
GL.
Subject
General Physics and Astronomy