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Tunneling characteristics of Y1−xPrxBa2Cu3O7−y/Pb planar junctions

✍ Scribed by H.T. Chen; T.T. Chen

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
401 KB
Volume
213
Category
Article
ISSN
0921-4534

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✦ Synopsis

We have fabricated electron tunneling junctions on thin films of Y t-;,PrxBa2Cu3OT-y, with x= 0-0.45, which were grown by laser ablation on (100) MgO substrates. The tunneling characteristics of the YBCO/Pb and YPBCO/Pb planar junctions were measured. They all exhibited Pb energy gap and phonon structures as well as the gap-like structure of YBCO at 4.2 K. However, no gap-like structure of YPBCO was observed with high Pr concentration. The differential conductance of YPBCO films changes discontinuously both in shape and in value at To. A tunneling model is proposed.

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Cu NQR in high Tc superconductor Y1−xPrx
Cu NQR in high Tc superconductor Y1−xPrxBa2Cu3O7
✍ T. Ohno; K. Koyama; H. Yasuoka 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 172 KB

The NQR spectra and the nuclear spin-lattice relaxation rate 1/T~ associated with the Cu(2) sites in Y~ -~Pr~BazCu307 with x = 0.1 and 0.2 have been investigated. The spectrum of Yo.sPro.2Ba2Cu30~ at 4.2 K is found to be broadened in the high-frequency side, and the half-width becomes two times of t