Abstract
Small and thin mesa structures of intrinsic Josephson junctions 1–2 μm on a side and 1.5–7.5 nm in thickness are fabricated from single crystals of Bi2–xPbxSr2CaCu2O8+δ with a nominal Pb content x from 0.2 to 0.5. The Josephson critical current density jc is found to be pronouncedly large, ranging from 10 to 50 kA/cm2. Switching current probability measurements for these mesa samples show an indication of a crossover to the macroscopic quantum tunneling region.
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