TY - JOUR
T1 - Vortex pinning
T2 - A probe for nanoscale disorder in iron-based superconductors
AU - Van Der Beek, C. J.
AU - Demirdis, S.
AU - Konczykowski, M.
AU - Fasano, Y.
AU - Cejas Bolecek, N. R.
AU - Pastoriza, H.
AU - Colson, D.
AU - Rullier-Albenque, F.
PY - 2012/6/1
Y1 - 2012/6/1
N2 - The pinning of quantized flux lines, or vortices, in the mixed state is used to quantify the effect of impurities in iron-based superconductors (IBS). Disorder at two length scales is relevant in these materials. Strong flux pinning resulting from nm-scale heterogeneity of the superconducting properties leads to the very disordered vortex ensembles observed in the IBS, and to the pronounced maximum in the critical current density j c at low magnetic fields. Disorder at the atomic scale, most likely induced by the dopant atoms, leads to weak collective pinning and a magnetic field-independent contribution j c coll. The latter allows one to estimate quasiparticle scattering rates.
AB - The pinning of quantized flux lines, or vortices, in the mixed state is used to quantify the effect of impurities in iron-based superconductors (IBS). Disorder at two length scales is relevant in these materials. Strong flux pinning resulting from nm-scale heterogeneity of the superconducting properties leads to the very disordered vortex ensembles observed in the IBS, and to the pronounced maximum in the critical current density j c at low magnetic fields. Disorder at the atomic scale, most likely induced by the dopant atoms, leads to weak collective pinning and a magnetic field-independent contribution j c coll. The latter allows one to estimate quasiparticle scattering rates.
KW - Critical current
KW - Heterogeneity
KW - Iron based superconductors
KW - Vortex pinning
U2 - 10.1016/j.physb.2012.01.021
DO - 10.1016/j.physb.2012.01.021
M3 - Article
AN - SCOPUS:84859551628
SN - 0921-4526
VL - 407
SP - 1746
EP - 1749
JO - Physica B: Physics of Condensed Matter
JF - Physica B: Physics of Condensed Matter
IS - 11
ER -