Nearly Ferromagnetic Superconductors

Details Nearly Ferromagnetic Superconductors Nearly Ferromagnetic Superconductors

2006-06-03

arxiv.org/abs/cond-mat/0606090v2

Phys. Rev. B 74, 134505 (2006)

Physics

Condensed Matter

Superconductivity

11 pp, 3 eps figs

Scientific paper

10.1103/PhysRevB.74.134505

The electromagnetic properties of superconductors near a ferromagnetic instability are investigated by means of a generalized Ginzburg-Landau theory. It is found that the magnetic flux expulsion capability of the superconductor gets stronger, in a well-defined sense, as the normal-state magnetic susceptibility increases. The temperature dependencies of the London penetration depth, the critical fields, and the critical current are all strongly affected by ferromagnetic fluctuations. In particular, for the critical current we find a temperature exponent alpha ~ 2 over an appreciable temperature range. The extent to which proximity to magnetic criticality may be a viable explanation for recent observations in MgCNi microfibers, which find alpha ~ 2, is discussed.

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