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Influence of lead substitution on the magnetic irreversibility line of 2212 superconducting single crystals

✍ Scribed by R. Bouzerar; B. Mettout; H. Savary; J. Schneck; J.C. Tolédano

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
830 KB
Volume
223
Category
Article
ISSN
0921-4534

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✦ Synopsis

An experimental study of the magnetic irreversibility lines has been carded out on superconducting single crystals of Bi2_,,Pb~Sr2CaCuO2Os, with and without lead. The irreversibility field values Bird(T) are almost identical for x= 0 and x= 0.4. However, the power-law fits of Bi~(T) ~ 1 / T" at low temperatures provide different exponents a in both cases, a = 6 in the leadfree sample and a= 4 in the lead-substituted sample. At high temperatures a regime change is observed in both samples and Bi= vanishes as ( To-T) p with fl= 1 for x= 0 and fl= 0.37 for x= 0.4. A discussion of these results is achieved within the TAFF and vortex solid melting models taking into account a possible "dimensional crossover" of the vortex system behavior.

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Lead substitution effects on the hystere
Lead substitution effects on the hysteresis curves and magnetic irreversibility lines 2212 compounds
✍ R. Bouzerar; B. Mettout; D. Fenkouche; H. Savary 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 222 KB

We discuss the nature of the magnetic irreversibility line for the Bi:2212 compounds with two different lead contents. A crossover is observed in both cases at two different temperatures. This cross-over is consistent with the dimensional change of the vortex ensemble predicted by Glazman and Koshel