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.
T. R. Kirkpatrick et al., "Strong Enhancement of Superconducting Tc in Ferromagnetic Phases," Physical Review Letters, vol. 87, no. 12, pp. 127003/1 - 127003/4, American Physical Society (APS), Sep 2001.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.87.127003
Keywords and Phrases
Approximation theory; Calculations; Carrier concentration; Elementary particles; Ferromagnetism; Green's function; Magnetic susceptibility; Magnetization; Mathematical models; Phase diagrams; Superconductivity, Bohr magneton; Electron number density; Heisenberg ferromagnetic phase; Hubbard model; Magnons; P-wave superconductivity, Superconducting transition temperature
International Standard Serial Number (ISSN)
Article - Journal
© 2001 American Physical Society (APS), All rights reserved.
01 Sep 2001