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Superconducting current relaxation in YBa2Cu3O7−δ thin films deposited on the CaNdAlO4 substrates

✍ Scribed by M. Jirsa; L. Půst; P. Boháček; J. Schneider; J. Schubert; R. Wördenweber

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

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✦ Synopsis

Decay of induced superconducting currents in YBa2Cu307 thin films deposited on the CaNdAlO4 substrates was measured by a vibrating sample magnetometer in magnetic fields up to *2 T and temperatures down to 4.2K. The experimental temperature dependence of the induced current density is is interpreted in terms of the interpolation formula combining effects of thermally assisted flux creep and macroscopic quantum creep. The analysis indicates importance of the macroscopic quantum tunnelling at temperatures bellow P 5K. Significant difference in the j&l dependences obtained on thin films prepared by different techniques (dcmagnetron sputtering and laser ablation) was observed especially at temperatures T < O.ST,.

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Critical current behavior in narrow YBa2
Critical current behavior in narrow YBa2Cu3O7−δ thin films
✍ Shuichi Tahara; S.M. Anlage; Chang-Boem Eom; D.K. Fork; T.H. Geballe; M.R. Beasl 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 139 KB

Critical current measurements are reported for narrow strips ( down to -1.0 gm) of YBa2Cu 3 07\_ 8 thin films deposited and lithographically patterned by various means. A systematic increase in Uae critical current aensities is observed in tile narrowest strips, suggesting the possible presence of e