Abstract
Flux trapping in the 9.3 GHz modulated microwave absorption spectra observed near 4 K from ceramic and powdered ceramic specimens of two separately prepared YBa2Cu3O7-δ samples has been used to separate the intergranular and intragranular contributions to the spectra. In the denser, glassy sample, a broad absorption with a peak near 400 Oe for forward sweeps was observed with appreciable intensity after the maximum flux was trapped. This spectrum is attributed to intergranular junctions, since its relative intensity was reduced on powdering and suspending in wax. In the less dense, more uniform sample, the latter spectrum was appreciably weaker in both ceramic and powder. Both types of junction appear to contribute to the narrow low-field absorption which was observed after zero field cooling in all the samples.
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Rubins, R.S., Hutton, S.L., Drumheller, J.E. et al. A comparison of the modulated microwave absorption spectra of ceramic and powdered YBa2Cu3O7-δ samples. Journal of Materials Research 5, 1813–1818 (1990). https://doi.org/10.1557/JMR.1990.1813
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DOI: https://doi.org/10.1557/JMR.1990.1813