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.
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.
Minoru SUZUKI;Kenji HAMADA;Ryota TAKEMURA;Masayuki OHMAKI;Itsuhiro KAKEYA. Overdoped High Current Density Bi2-xPbxSr2CaCu2O8+δ Intrinsic Josephson Junction Mesas and Their Switching Current Distributions[J]. 中国物理快报, 2010, 27(8): 87406-087406.
Minoru SUZUKI, Kenji HAMADA, Ryota TAKEMURA, Masayuki OHMAKI, Itsuhiro KAKEYA. Overdoped High Current Density Bi2-xPbxSr2CaCu2O8+δ Intrinsic Josephson Junction Mesas and Their Switching Current Distributions. Chin. Phys. Lett., 2010, 27(8): 87406-087406.
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