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We establish universal behavior in temperature dependencies of someobservables in $(s+id)$-wave BCS superconductivity in the presence of a weak$s$ wave. There also could appear a second second-order phase transition. Astemperature is lowered past the usual critical temperature $T_c$, a lessordered superconducting phase is created in $d$ wave, which changes to a moreordered phase in $(s+id)$ wave at $T_{c1}$ ($< T_c$). The presence of two phasetransitions manifest in two jumps in specific heat at $T_c$ and $T_{c1}$. Thetemperature dependencies of susceptibility, penetration depth, and thermalconductivity also confirm the new phase transition.Comment: 6 pages, 5 post-script figures

Two phase transitions in (s + id)-wave Bardeen - Cooper - Schrieffer superconductivity