Strong Enhancement of Superconducting T_c in Ferromagnetic Phases

Details Strong Enhancement of Superconducting T_c in Ferromagnetic Phases Strong Enhancement of Superconducting T_c in Ferromagnetic Phases

2001-05-31

arxiv.org/abs/cond-mat/0105627v2

Phys. Rev. Lett. 87, 127003 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, REVTeX, 4 eps figures, final version as published

Scientific paper

10.1103/PhysRevLett.87.127003

It is shown that the critical temperature for spin-triplet, p-wave superconductivity mediated by spin fluctuations is generically much higher in a Heisenberg ferromagnetic phase than in a paramagnetic one, due to the coupling of the magnons to the longitudinal magnetic susceptibility. Together with the tendency of the low-temperature ferromagnetic transition in very clean Heisenberg magnets to be of first order, this qualitatively explains the phase diagram recently observed in UGe_2.

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