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Motivated by recent experiments observing half-integer flux quanta inmesoscopic loops of superconducting Sr2RuO4, a theory is developed based on a"d-soliton", a topological defect of spin-triplet superconductors involving achange of the spin configuration. A phenomenological Ginzburg-Landau freeenergy is given which allows to describe such a soliton yielding a half-integerflux quantum inside a loop, assuming a chiral p-wave superconducting phase. Thed-soliton couples to spin polarization perpendicular to the loop axis, whichallows to reduce the energy of the d-soliton, fitting well to the experimentalfindings. The origin of this coupling lies in the combination of spin andcharge current within the d-soliton generating a spin polarization analogous toa spin Hall effect. The effect of Fermi liquid corrections is discussed, inparticular, in view of the spatial extension of the d-soliton and theenergetics in comparison with a standard integer flux state.

Releasing half-quantum vortices via the coupling of spin polarization, charge- and spin-current