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Direct observation of non-collinear vortex structures induced by twin boundaries in YBa2Cu3Oy single crystals

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Abstract

Using vector magnetic moment measurements, in twinned YBa2Cu3Oy single crystals we observe a nearly reversible Mab component of the magnetisation with sharp peaks in the dependence of Mab on the magnetic field H and angle ϕ between c-axis and magnetic field. The association of these features with twin boundaries is supported by geometrical arguments and by comparison with detwinned samples. For a crystal with a single dominant direction of twin boundaries, the initial slope of the Mab(H) and Mab(ϕ) dependences corresponds closely to ideal shielding of the transverse H component, as expected for the fully-locked vortex state. The peak position, which is related to the locking angle, shows a close to linear Hp −1 vs ϕ dependence, which corresponds to a fixed value of HL, the locking field. The influence of twins vanishes above a trapping angle ϕT which shows rather weak temperature and magnetic field dependences; at 60K and 1T these parameters are μoHL=27mT and ϕT ≈ 10 °.

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Authors and Affiliations

  1. Centre for HTS, Blackett Laboratory, Imperial College, SW7 2BZ, London, UK

    A. A. Zhukov, G. K. Perkins, J. V. Thomas & A. D. Caplin

  2. Physics Department, Moscow State University, 117234, Moscow, Russia

    A. A. Zhukov

  3. Forschungszentrum Karlsruhe, Institut für Technische Physik, D-76021, Karlsruhe, Germany

    H. Küpfer & T. Wolf

Authors
  1. A. A. Zhukov
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  2. G. K. Perkins
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  3. J. V. Thomas
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  4. A. D. Caplin
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  5. H. Küpfer
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  6. T. Wolf
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Zhukov, A.A., Perkins, G.K., Thomas, J.V. et al. Direct observation of non-collinear vortex structures induced by twin boundaries in YBa2Cu3Oy single crystals. J Low Temp Phys 105, 1105–1110 (1996). https://doi.org/10.1007/BF00753847

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  • DOI: https://doi.org/10.1007/BF00753847

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