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Phys. Rev. Lett. 87, 127003 (2001) [4 pages]

Strong Enhancement of Superconducting Tc in Ferromagnetic Phases

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T. R. Kirkpatrick1, D. Belitz2, Thomas Vojta3,4, and R. Narayanan3
1Institute for Physical Science and Technology, and Department of Physics, University of Maryland, College Park, Maryland 20742
2Department of Physics, and Materials Science Institute, University of Oregon, Eugene, Oregon 97403
3Department of Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, United Kingdom
4Institut für Physik, TU Chemnitz, D-09107 Chemnitz, Federal Republic of Germany

Received 1 June 2001; published 30 August 2001

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 UGe2.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.127003
DOI:
10.1103/PhysRevLett.87.127003
PACS:
74.20.Mn, 74.25.-q, 74.62.Fj
 
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