|Title||Ground state of the three-dimensional BCS d-wave superconductor|
|Publication Type||Journal Article|
|Year of Publication||2019|
|Authors||I. F. Herbut, I. Boettcher, and S. Mandal|
|Journal||Phys. Rev. B|
|Date Published||SEP 4|
|Type of Article||Article|
We determine the mean-field ground state of the three-dimensional rotationally symmetric d-wave (l = 2) superconductor at weak coupling. It is a noninert state, invariant under the symmetry C-2 only, which breaks time-reversal symmetry almost maximally, and features a high but again less-than-maximal average magnetization. The state obtained by minimization of the expanded sixth-order Ginzburg-Landau free energy is found to be an excellent approximation to the true ground state. The coupling to a parasitic s-wave component has only a minuscule quantitative and no qualitative effect on the ground state.