Abstract
We propose theoretically that the application of magnetic fields can induce spin-triplet superconductivity in repulsively interacting electron systems having strong ferromagnetic spin fluctuations. We have confirmed the general idea in the Hubbard model on the triangular lattice, whose Fermi surface consists of disconnected pockets for low electron concentrations, by numerically calculating the pairing susceptibility in a moderate magnetic field with the dynamical cluster approximation combined with the quantum Monte-Carlo method.
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