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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4639

Title: High temporal stability of supercurrents in MgB2 materials
Authors: Thompson, J.R.
Paranthaman, M.
Christen, D.K.
Sorge, K.D.
Kim, H.J.
Ossandon, J.G.
Issue Date: 2001
Publisher: Institute of Physics and IOP Publishing Limited
Citation: Superconductor Science & Technology 14: L17-L20
Abstract: Fine grained polycrystalline samples of MgB2 superconductor were synthesized from the elements to contain < 5 % of impurity phases, according to x-ray powder diffractometry. The superconductive transition was sharp with a midpoint Tc = 38.5 K. The magnetization in the vortex state was studied as a function of applied field H, temperature T and time t. From the equilibrium magnetization, the London penetration depth was obtained. The supercurrent density J(T,H,t) in the vortex state (derived from the irreversible magnetization) decreases approximately linearly with T, in contrast to the quasi-exponential fall-off in high-Tc superconductors. The current is highly stable in time, with normalized decay rates S = - d ln(J)/d ln(t) well below those in high-Tc materials. These results are compared with those of other superconductors
Description: Ossandon, J.G. Department of Engineering Sciences, Universidad de Talca, Curicó, Chile.
URI: http://dspace.utalca.cl/handle/1950/4639
ISSN: 0953-2048
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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