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Strong Enhancement of Superconducting T_c in Ferromagnetic Phases

T. R. Kirkpatrick·D. Belitz·Thomas Vojta·R. Narayanan
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Abstract

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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T. R. Kirkpatrick, D. Belitz, Thomas Vojta, R. Narayanan. 2003-07-14. Strong Enhancement of Superconducting T_c in Ferromagnetic Phases. https://doi.org/10.1103/physrevlett.87.127003

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