Spin susceptibility and field-induced chiral stability in non-unitary chiral superconductivity

Assuming non-unitary chiral p-wave state of E_u in D_4h for superconductivity in Sr₂RuO₄(SRO), we show spin susceptibility and gap function in bulk state, and field-induced chiral stability generating paramagnetic current in 3-Kelvin(3K) phase of Ru-SRO. The results indicate that the non-unitary chiral E_u is one of candidates for superconducting state of SRO, as well as chiral even-parity E_g.
The d-vector, described by two components for (k_xz+k_zx, k_yz+k_zy), leads gap function with a horizontal minimum line at k_z=0. The spin susceptibility is reduced at T< T_c, and it consists to drop of Knight-shift in H//ab.
Analyzing GL eq. for non-unitary chiral E_u, the applied H//c causes field-induced chiral stability generating paramagnetic current in 3K phase. The chiral stability drives second order parameter additionally to one order parameter, and it consists to the occurrence of second superconducting transition with a new order parameter visible as zero-bias anomaly in tunneling spectroscopy. This discussion is qualitatively analogous to chiral states for unitary E_u and even-parity E_g[H.K.,et al.,PRB100(2019)214501]. The paramagnetic current is slightly reduced in non-unitary state comparing to unitary one, and it almost unchangs field-induced chiral stability.