Strong enhancement of superconducting T(c) in ferromagnetic phases.
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).
Kirkpatrick
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Institute for Physical Science and Technology, Department of Physics, University of Maryland, College Park, MD 20742, USA.
Belitz
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Vojta
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Narayanan
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