In $f$-electron heavy fermion superconductors the presence of a spin resonance in the inelastic magnetic response is commonly associated with an unconventional nodal gap function that is not fully symmetric. However it appears possible that the resonance is still observed even when the low temperature thermodynamic behavior suggests a fully gapped state. We investigate such possibility within a two-dimensional toy model of a hybridized superconductor with a fully symmetric $s_{\pm }$ unconventional symmetry with different sign of the gap function on disjoint Fermi surface sheets. We compute the collective magnetic response function in the hybridized superconducting state of the two-band model and show that the appearance of the resonance is also possible for the fully gapped state.

在 $F$-电子重费米子超导体非弹性磁响应中自旋共振的存在通常与不完全对称的非常规节点间隙函数有关。但是，即使低温热力学行为表明完全处于空位状态，也可能仍然观察到共振。我们在具有完全对称的混合超导体的二维玩具模型中研究这种可能性$s_{\pm }$不相交的费米曲面上具有不同间隙函数符号的非常规对称。我们在两带模型的混合超导状态下计算了集体磁响应函数，结果表明，对于全能隙状态，共振的出现也是可能的。