Evidence for a directed δTc-type flux pinning by means of nanostripes in (Sm0.33Eu0.33Gd0.33)Ba2Cu3Oy high-Tc superconductors
Institute of Experimental Physics, Saarland University, Campus C 6 3 - D-66123 Saarbrücken, Germany, EU
Corresponding author: firstname.lastname@example.org
Accepted: 9 February 2010
By means of four-point transport measurements on bulk, high-Tc superconducting samples of composition (Sm0.33Eu0.33Gd0.33)Ba2Cu3Oy exhibiting self-organized nanostripes formed by nanoclusters of the light-rare-earth–rich phase, we find that at temperatures close to the transition temperature the currents flowing parallel to the nanostripes are clearly larger than in the perpendicular direction. Constructing a pinning force diagram from the jc(Ha)-data obtained, we find strong evidence for a dominating δTc-pinning when the currents are flowing parallel to the nanostripes.
PACS: 74.72.-h – Cuprate superconductors / 74.25.Wx – Vortex pinning (includes mechanisms and flux creep) / 74.25.Sv – Critical currents
© EPLA, 2010