Imaging Local Dissipation and Magnetic Field in YBCO Films With Artificial Defects

Abstract

Index Terms-High-temperature superconductors, laser applications, local electric field, local magnetic field, low temperature scanning laser microscopy, magneto optical imaging.

Local Current Transport and Current Sharing Between Filaments in Striated Coated Conductors With Artificial Defects

“…An earlier paper by Abraimov et al [14] shows that the strong dissipation is observed where the cross sectional area of current transport is reduced and the local current density is high in an epitaxial YBCO film on SrTiO3 substrate. In the fishnet pattern striated CC sample studied, we also find that the increased local current density is the most important factor in the dissipation.…”

Study of grain boundary transparency in(Yb1−xCax)BLi1, Abraimov2, Polyanskii3 et al. 2015Phys. Rev. B140130View full textAdd to dashboardCite

“…Local transport J c measurement using LTSLM The low temperature scanning laser microscope (LTSLM) is a hot spot probe technique [16,[18][19][20] which utilizes a focused probe laser beam to scan the sample surface to induce local temperature perturbations while the voltage change δV responses across the sample are recorded as a function of scan position (x,y). The spatially resolved δV(x,y) responses reflect the local property variation of the superconductor samples.…”

“…The spatially resolved δV(x,y) responses reflect the local property variation of the superconductor samples. Detailed descriptions of the principles of LTSLM and our setup can be found in [16,21]. Here we focus on two applications of LTSLM that are relevant to this study, the measurement of local J c at T<T c and visualization of the local grain orientation by measurement of thermoelectric power at room temperature.…”

“…In this study, the effect of applied field and its angle to the GB plane, temperature, Ca-doping level and oxygen content established during post-growth anneals were evaluated. Visualization of the GB properties by Low Temperature Scanning Laser Microscopy (LTSLM) [16] and Magneto-Optic Imaging (MOI) [17] was used to study r GB . In previous studies, the transparency of the GBs was most usually evaluated by standard four-probe DC transport measurement.…”

Optically activated high Tc superconducting microbolometer

“…By displacing the laser beam along the stripe we obtain a voltage signal that is modulated by the temperature distribution due to the external thermal effects. The similar laser induced hot spot scanning method is used for investigation of spatial distribution of superconducting parameters and defects visualization [6][7].…”