Abstract
We have prepared in situ YBa2Cu3O7/PrBa2Cu307 (YBCO/PrBCO) superlattices by single target dc planar magnetron sputtering and have studied the superconducting properties of these artificially modulated structures. We find that the superconducting critical temperature, Tc, for series of samples with constant 12 or 24Å layers of YBCO initially decreases with increasing thickness of PrBCO, d-PrBCO, and then for d-PrBCO larger than 60–70Å remains about constant. We discuss this behavior in terms of a progressive decoupling of the ultrathin YBCO layers in the multilayer. Perpendicular critical field measurements show for the 24Å-YBCO multilayer series a behavior similar to that of YBCO. However, when the field is applied parallel to the layers we find that the broadening of the transition is strongly reduced for d-PrBCO larger than 12Å and for samples with d-PrBCO>24Å no measurable effect of a 9 Tesla magnetic field parallel to the layers could be detected. We believe that this insensitivity to the magnetic field comes from the absence of flux flow in these modulated structures.
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Triscone, JM. et al. (1990). Superconducting Properties of YBa2Cu3O7/PrBa2Cu3O7 Superlattices. In: McConnell, R.D., Noufi, R. (eds) Science and Technology of Thin Film Superconductors 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1345-8_3
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DOI: https://doi.org/10.1007/978-1-4684-1345-8_3
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