Normal-state re-entrant peak in the vortex transformer measurement for Bi-2212/Bi-2223 intergrowth single crystals

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Abstract

A normal-state re-entrant behaviour in the Bi2Sr2CaCu2O8/Bi2Sr2Ca2Cu3O10(Bi-2212/Bi-2223) intergrowth single crystals is observed with the 'flux-transformer' measurements. After entering the superconducting state at Tc1= 107 K, the intergrowth system re-enters the normal state at a temperature slightly higher than the superconducting transition temperature of the Bi-2212 phase (Tc2= 92 K). This re-entrant phenomenon is consistent with our previous observations in the measurements with the conventional four-probe technique. However, some new behaviours have been found in the flux-transformer measurements, namely a two-head peak near Tc2is observed. The position and the height of the peak are sensitive to driving currents and applied magnetic fields. The origin of the two-head peak has been attributed to the vortex motion and the superconducting transition of the Bi-2212 matrix. © 2002 Elsevier Science B.V. All rights reserved.

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Zhu, X. T., Zhao, Y., Gu, G. D., Zhang, H., & Koshizuka, N. (2003). Normal-state re-entrant peak in the vortex transformer measurement for Bi-2212/Bi-2223 intergrowth single crystals. Physica C: Superconductivity and Its Applications, 384(3), 258–266. https://doi.org/10.1016/S0921-4534(02)01962-7

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