Abstract
The electron spin resonance (ESR) technique has been used to obtain the Microwave (mw) penetration depth of YBa2Cu3O7 thin films. An ESR-signal-generating marker was placed in between two high temperature superconducting (HTSC) films to probe the mw field penetrating through the films. Below the superconducting transition temperature (Tc) the HTSC film started to screen the marker inside the sandwich. A meaningfully diminishing ESR signal was reproducibly recorded for various samples with different markers such as paramagnetic diphenyl pierylhydrazy (DPPH), Mn++ impurity in MgO and a Ferromagnetic (FM) permalloy film. Temperature dependence of ESR signal intensity above and below Tc has been studied to deduce the penetration depth from the measured signal intensity. A very rapid change of λ just below Tc, slowed down later at lower temperatures and became smoothly changing. A λ ab=1020 Åvalue has been measured for c-axis films at 77K.
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Aktaş, B., Durusoy, H.Z. (1997). Penetration Depth Measurements in Epitaxiel YBCO Thin Films by the ESR Technique. In: Kossowsky, R., Jelinek, M., Novak, J. (eds) Physics and Materials Science of High Temperature Superconductors, IV. NATO ASI Series, vol 26. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5732-2_19
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DOI: https://doi.org/10.1007/978-94-011-5732-2_19
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