TY - JOUR
T1 - Magnetic field dependence of the critical current in YBa 2Cu 3O 7-δ/Au/Nb ramp-zigzag Josephson junctions
AU - Scharinger, S.
AU - Turad, M.
AU - Stöhr, A.
AU - Leca, V.
AU - Goldobin, E.
AU - Mints, R. G.
AU - Koelle, D.
AU - Kleiner, R.
PY - 2012/10/24
Y1 - 2012/10/24
N2 - We study the critical current I c dependence on applied magnetic field H for multifacet YBa 2Cu 3O 7-δ/Au/Nb ramp-type zigzag Josephson junctions. For many experiments, one would like to apply a homogeneous field in the junction plane. However, even tiny misalignments can cause drastic deviations from homogeneity. We show this explicitly by measuring and analyzing I c versus H for an eight-facet junction, forming an array of 4×(0-π) segments. The ramp angle is θ r=8. H is applied under different angles θ relative to the substrate plane and different angles φ relative to the in-plane orientation of the zigzags. We find that a homogeneous flux distribution is only achieved for an angle θ h1-2 and that even a small misalignment ∼0.1 relative to θ h can cause a substantial inhomogeneity of the flux density inside the junction, drastically altering its I c versus H interference pattern. We also show that there is a dead angle θd* relative to θ h of similar magnitude, where the average flux density completely vanishes.
AB - We study the critical current I c dependence on applied magnetic field H for multifacet YBa 2Cu 3O 7-δ/Au/Nb ramp-type zigzag Josephson junctions. For many experiments, one would like to apply a homogeneous field in the junction plane. However, even tiny misalignments can cause drastic deviations from homogeneity. We show this explicitly by measuring and analyzing I c versus H for an eight-facet junction, forming an array of 4×(0-π) segments. The ramp angle is θ r=8. H is applied under different angles θ relative to the substrate plane and different angles φ relative to the in-plane orientation of the zigzags. We find that a homogeneous flux distribution is only achieved for an angle θ h1-2 and that even a small misalignment ∼0.1 relative to θ h can cause a substantial inhomogeneity of the flux density inside the junction, drastically altering its I c versus H interference pattern. We also show that there is a dead angle θd* relative to θ h of similar magnitude, where the average flux density completely vanishes.
UR - http://www.scopus.com/inward/record.url?scp=84868103736&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.86.144531
DO - 10.1103/PhysRevB.86.144531
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AN - SCOPUS:84868103736
SN - 1098-0121
VL - 86
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
M1 - 144531
ER -