Variable sample temperature scanning superconducting quantum interference device microscope

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.123244· OSTI ID:349329

Kirtley, J R; Tsuei, C C ^[1]; Moler, K A ^[2]; Kogan, V G; Clem, J R ^[3]; Turberfield, A J ^[4]

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1. IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (United States)
2. Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
3. Ames Laboratory and Physics Department ISU, Ames, Iowa 50011 (United States)
4. Department of Physics, University of Oxford, Clarendon Laboratory Parks Road, Oxford OX13PU (United Kingdom)

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-T{sub c} SQUID. We demonstrate this approach by imaging the temperature dependence of Abrikosov vortices in thin films of the high-temperature superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. We extract the in-plane penetration depth {lambda}{sub ab}(T) in our samples from these measurements. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 349329
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 74; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
DESIGN
HIGH-TC SUPERCONDUCTORS
MICROSCOPES
PENETRATION DEPTH
SQUID DEVICES
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
VORTICES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES