Abstract
Tunneling and point-contact measurements have been performed on different high-T c superconductors M−Ba2Cu3O7 with M=Y, La, Eu. The average energy gaps deduced from the tunneling spectra are about 2Δ=33 meV for the Y- and La-type samples and about 2Δ=38 meV for the Eu-type samples, which give ratios 2Δ/k B T c in the range from 4 to 6. The point-contact characteristics show a distinct minimum in the differential resistance about zero bias and additional sharp spikes up to 40 mV. From these pointcontacts we can give an estimate of the critical current, yielding values in the range from 0.2 to 3 mA.
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Hohn, N., Koltun, R., Schmidt, H. et al. Tunneling and point-contact spectroscopy of high-T c superconductors M−Ba2Cu3O7 (M=Y, La, Eu). Z. Physik B - Condensed Matter 69, 173–178 (1987). https://doi.org/10.1007/BF01307273
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DOI: https://doi.org/10.1007/BF01307273