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Tunneling spectroscopy at 4.2 K and 56 K on Bi4Ca3Sr3Cu4O16+δ

✍ Scribed by Miguel A. Ramos; Sebastián Vieira

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
140 KB
Volume
162-164
Category
Article
ISSN
0921-4534

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✦ Synopsis

We report tunneling I-V characteristics at 4.2 K and 56 K of the high-T c superconductor Bi4Ca3Sr3Cu4016+~, using a Scanning Tunneling Microscope (Sll~). These results are analysed using different methods for the energy-gap determination. The most consistent interpretation of our measurements, both at 4.2 K and 56 K, is obtained introducing quasiparticle lifetime effects into the BCS density of states. This analysis gives a ratio 2A/KBT c = 5.5-6.

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✍ L. Buschmann; M. Boekholt; G. Güntherodt 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 481 KB

We report on N-I-S point contact and S-I-S break junction tunneling measurements at T=4.2 K on Bi2Sr2CaCu2Os+6 single crystals (Tc = 78-86 K). For the latter experiments, the breaking of the crystal was done in liquid He atmosphere in order to produce clean surfaces. The superconducting energy gap s