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Scanning/friction force microscopy study of YBa2Cu3O7−δ single crystals grown in BaZrO3 crucibles

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Abstract

Very pure YBa2Cu3O7−δ (YBCO) single crystals grown in BaZrO3 crucibles are studied in the as-grown and the oxidized state by scanning force (SFM), friction force (FFM) and scanning tunneling microscopies (STM). The images show clean terraces with step-heights of one unit cell along YBCO(001), i.e. 1.2 nm. Only close to step edges is material contrast observed by FFM indicating traces af flux. Some crystal surfaces exhibit over-layer features, such as star-like, ribbon-like and checkerboard-like structures, which exhibit friction contrast implying the presence of different materials on the surface. Tunneling spectroscopy at 4.7 K in high vacuum reveals a superconducting energy gap of 2Δ ≈ 26 me V.

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Authors and Affiliations

  1. Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056, Basel, Switzerland

    H. P. Lang, A. Erb, P. Jess, U. Hubler & H. -J. Güntherodt

  2. DPMC, University of Geneva, 24, quai Ernest-Ansermet, CH-1211, Genève, Switzerland

    A. Erb

Authors
  1. H. P. Lang
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  2. A. Erb
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  3. P. Jess
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  4. U. Hubler
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  5. H. -J. Güntherodt
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Lang, H.P., Erb, A., Jess, P. et al. Scanning/friction force microscopy study of YBa2Cu3O7−δ single crystals grown in BaZrO3 crucibles. J Low Temp Phys 105, 1373–1378 (1996). https://doi.org/10.1007/BF00753891

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  • DOI: https://doi.org/10.1007/BF00753891

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