Measuring the Absolute Penetration Depth in Superconducting Materials.

ORAL

Abstract

The absolute penetration depths of a variety of superconductors were measured using a method involving a high precision tunnel diode oscillator and an Aluminum film coating method [1]. Variations of the Al film geometry (thickness, coverage area, etc) and microstructure (grain size, RRR, etc) were used to test the reliability and versatility of the coating technique. A variety of supplemental techniques (dual beam SEM, EBS, AFM, XRD, etc) were used to independently characterize the films and control their quality. Special emphasis was placed on measurements of cobalt doped iron pnictide samples given the well established quality of such samples now available. Work at UIUC supported by NSF DMR 10-05708, and Center for Emergent Superconductivity USDOE Award No. DE-AC02-98CH10886. Work at the Ames Laboratory was supported by the division of Materials Science and Engineering, Basic Energy Sciences, Department of Energy (US DOE), under Contract No. DEAC02-07Ch11358. \\[4pt] [1] R. Prozorov, et al, Appl. Phys. Lett 77,1202 (2000)

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Authors

  • Nicholai Salovich

    Iowa State University, Ames Laboratory, University of Illinois at Urbana-Champaign

  • Russell Giannetta

    University of Illinois at Urbana-Champaign, IL 61801, University of Illinois at Urbana Champaign

  • Nicholai Salovich

    Iowa State University, Ames Laboratory, University of Illinois at Urbana-Champaign

  • Paul Canfield

    Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University, Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Iowa State University, Iowa State University and Ames Lab., Iowa State University/Ames Lab, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa State University, IA, USA, Ames Laboratory, Ames, IA 50011, U.S.A., Ames Laboratory, Iowa State University

  • Sergey Bud'ko