Sheet-current distribution in a dc SQUID washer probed by vortices

Dietmar Doenitz; Matthias Ruoff; Ernst Helmut Brandt; John R. Clem; Reinhold Kleiner; Dieter Koelle

doi:10.1103/PhysRevB.73.064508

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Sheet-current distribution in a dc SQUID washer probed by vortices

Dietmar Doenitz, Matthias Ruoff, Ernst Helmut Brandt, John R. Clem, Reinhold Kleiner, Dieter Koelle

DOI 10.1103/PhysRevB.73.064508 · Physical Review B

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Abstract

We present a method, based on vortex imaging by low-temperature scanning electron microscopy (LTSEM), to directly image the sheet-current distribution in YBa2Cu3O7 dc superconducting quantum interference device washers. We show that the LTSEM vortex signals are simply related to the scalar stream function describing the vortex-free circulating sheet-current distribution J. Unlike previous inversion methods that infer the current distribution from the measured magnetic field, our method uses pinned vortices as local detectors for J. Our experimental results are in very good agreement with numerical calculations of J.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown