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Josephson tunneling between a conventional superconductor (Pb) and YBa2Cu3O7-δ

✍ Scribed by R.C. Dynes

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
294 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

The symmetry of the order parameter in the high Tc cuprates can be probed by investigation of its phase using various squid configurations. Even more simply, an investigation of the overlap of the pair wavefunction of a conventional superconductor with a high Tc cuprate should reveal the symmetry of the cuprate. We have been studying this overlap by Josephson tunneling (tunneling as opposed to SNS or weak link) between Pb and YBa2Cu307. & The observation of a Josephson coupling in the c-axis implies the order parameter in the cuprate is not strictly dx2~2 symmetry. Measurements of the magnetic field dependence of the Josephson current Ie(B) allow a direct, d.c. measurement of the low temperature penetration depth. Studies have been performed on twinned and untwinned single crystals and thin films. *In collaboration with A.

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✍ Floriana Lombardi; Thilo Bauch; Karin Cedergren; Jesper Johansson; Tobias Lindst 📂 Article 📅 2007 🏛 Elsevier Science 🌐 English ⚖ 437 KB

We have observed energy level quantization in an all high critical temperature superconductor d-wave Josephson junction. From the measurements we have also extracted the quality factor Q of the junction which is of the order of 40. These results indicate that the role of dissipation mechanisms in hi