We demonstrate a design for a scanning superconducting quantum interference device (SQUID) microscope in which the sample temperature can be varied over a large range. In this design, both sample and SQUID are in the same vacuum space, separated by a few microns. By firmly anchoring the SQUID to a low-temperature bath, the sample temperature can be changed while the SQUID remains superconducting. This allows magnetic imaging at varying sample temperatures with micron-scale spatial resolution and the sensitivity of a low- SQUID. We demonstrate this approach by imaging the temperature dependence of Abrikosov vortices in thin films of the high-temperature superconductor We extract the in-plane penetration depth in our samples from these measurements.
Variable sample temperature scanning superconducting quantum interference device microscope
J. R. Kirtley, C. C. Tsuei, K. A. Moler, V. G. Kogan, J. R. Clem, A. J. Turberfield; Variable sample temperature scanning superconducting quantum interference device microscope. Appl. Phys. Lett. 28 June 1999; 74 (26): 4011–4013. https://doi.org/10.1063/1.123244
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