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Flux noise, vortex glass transition, and irreversibility line in ceramic Tl2Ba2Ca2Cu3O10−δ high-Tc superconductors

✍ Scribed by Z.Q. Yu; L.K. Yu; W.J. Yeh; Y. Xin; K.W. Wong

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
404 KB
Volume
231
Category
Article
ISSN
0921-4534

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✦ Synopsis

The flux noise and irreversibility line in ceramic Tl2Ba2Ca2Cu3Oto_6 high-To superconductors have been measured by a DC SQUID, and the vortex glass transition has been detected by the standard four-terminal I vs. Vmeasurement. In the low magnetic field region (0<H< 1000 Oe), it is found that the flux-noise peak coincides with the vortex glass phase transition temperature T s. However, there is an obvious difference in temperature between the irreversibility temperature T~ and T s. T~ is always higher than T v Our experimental results indicate that the irreversibility line is a dynamical boundary rather than a phase boundary.

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