Nearly ferromagnetic superconductors: Electromagnetic properties studied by a generalized Ginzburg-Landau theory

Qi Li; D. Belitz; T. R. Kirkpatrick

doi:10.1103/PhysRevB.74.134505

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Nearly ferromagnetic superconductors: Electromagnetic properties studied by a generalized Ginzburg-Landau theory

Qi Li, D. Belitz, T. R. Kirkpatrick

DOI 10.1103/PhysRevB.74.134505 · Physical Review B

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Abstract

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 α≈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 α≈2, is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.8	Pressure not reported	unknown