The « irreversibility line » of Bi2-xPbxSr2Ca2Cu3O10 : a possible breakdown of an intrinsic proximity effect

Abstract

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Classification and analysis of the non stoichiometry features in the layered lead and thallium cuprates

“…[24][25][51][52]. In the same way, the introduction of additional [Ca0]oo layers, leading to "superdislocations", which increases the thickness of the "normal" layers should tend to weaken the superconducting properties in agreement with the arguments based on the proximity effect developped by Tournier et al [53].…”

Changes in irreversibility line, anisotropy, and condensation energy by oxygen depletion ofYBa2Cu3O<

“…4 More anisotropic high-T c compounds have lower H irr c (t), and at low temperatures tend to show deviations from power-law behavior. 19,20 More precisely, an initial power law H irr c ϰt n , where nϭ1 -1.5, changes at low temperatures to a straight line on a ln H irr c versus T plot. For both highly anisotropic Bi2223 and Bi2212, H irr c ϭH 0 exp(ϪT/T 0 ) is observed at low temperatures and over a wide range of T. 20,21 A similar increase in H irr c above an initial power-law dependence was found for oxygen-deficient YBCO as well, 19 indicating a similar exponential form of H irr c at low temperatures.…”

“…19,20 More precisely, an initial power law H irr c ϰt n , where nϭ1 -1.5, changes at low temperatures to a straight line on a ln H irr c versus T plot. For both highly anisotropic Bi2223 and Bi2212, H irr c ϭH 0 exp(ϪT/T 0 ) is observed at low temperatures and over a wide range of T. 20,21 A similar increase in H irr c above an initial power-law dependence was found for oxygen-deficient YBCO as well, 19 indicating a similar exponential form of H irr c at low temperatures. In general, the lower values of H irr c for the more anisotropic high-T c systems allow larger and different regions of the H irr c (T) line to be investigated.…”

Review of the critical current densities and magnetic irreversibilities in high Tc superconductors

“…On the other hand, more recently Chaffron et al [313] and Aguillon et al [25,314] [25]) for H parallel to the c direction and H lying in the a-b planes. A second texturing method which is begining to be explored is through the application of a magnetic field in the melted phase [320][321][322][323][324][325]. [322][323][324][325].…”