Irreversibility line of Bi2223/Ag tape in high magnetic fields

Kušević, Ivica and Babić, Emil and Cooper, John R. and Wang, Wei Guo and Liu, Hua Kun and Dou, Shi Xue (1999) Irreversibility line of Bi2223/Ag tape in high magnetic fields. Fizika A, 8 (4). pp. 319-332. ISSN 1330-0008

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The magnetoresistance of a (Bi,Pb)_2Sr_2Ca_2Cu_3O_10+y Ag sheathed tape was measured in the temperature range 15 K ≤ T ≤ 120 K and magnetic field B ≤ 15 T applied perpendicular to the broader surface of tape. Throughout the explored field range, the onset of resistivity shows Arrhenius behaviour ρ ∝ exp(-U^*(1-T/T_cs)/kBTB^0.5) where U^* is the sample dependent constant, and T_cs is the temperature somewhat higher than the temperature of the resistivity onset. The observed resistance variation can be attributed to a thermally activated flux flow in a highly viscous vortex-liquid regime characterized by a plastic deformation of vortices. Experimentally determined resistive irreversibility line B_irr vs. T_irr follows the power-law dependence B_irr(T_irr) ∝(T_cs/T_irr-1)^2 which can be derived from the exponential behaviour of resistivity. Our Birr(T_irr) data can also be fitted by the combination of the Josephson coupling model and depinning of pancake vortices. This fit provides very reasonable values for B_c2, B_c1, B_c, ξ_ab and αab of Bi2223 compound, and removes the unphysical divergence of Birr(T-> 0) resulting from the above power-law fit.

Item Type: Article
Keywords: magnetoresistance, viscous vortex-liquid regime, resistive irreversibility line
Date: 1999
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 Apr 2014 18:00
Last Modified: 14 Apr 2014 18:00

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