Super-hard Superconductivity

Details Super-hard Superconductivity Super-hard Superconductivity

2004-10-10

arxiv.org/abs/cond-mat/0410238v3

Supercond. Sci. Technol. 18 (5), 776-779 (2005)

Physics

Condensed Matter

Superconductivity

corrected Fig. 1

Scientific paper

10.1088/0953-2048/18/5/034

We present a study of the magnetic response of Type-II superconductivity in the extreme pinning limit, where screening currents within an order of magnitude of the Ginzburg-Landau depairing critical current density develop upon the application of a magnetic field. We show that this "super-hard" limit is well approximated in highly disordered, cold drawn, Nb and V wires whose magnetization response is characterized by a cascade of Meissner-like phases, each terminated by a catastrophic collapse of the magnetization. Direct magneto-optic measurements of the flux penetration depth in the virgin magnetization branch are in excellent agreement with the exponential model in which J_c(B)=J_co exp(-B/B_o), where J_co~5x10^6 A/cm^2 for Nb. The implications for the fundamental limiting hardness of a superconductor are discussed.

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