d_{x^2-y^2}波115重电子超导体中的场致自旋激子二重态分裂
Field induced spin exciton doublet splitting in d_{x^2-y^2}-wave 115-heavy electron superconductors
摘要：
用中子非弹性散射方法研究了CeMIn_5重费米子化合物在反铁磁波矢下超导d_{x^2-y^2}态的自旋激子模。我们提出了一个理论模型，解释了两个场方向的场依赖性。我们发现最近观察到的CeCoIn_5中自旋激子偶分裂为两个非简并模的现象在这个模型中自然出现。这是由于自旋各向异性的g因子和准粒子相互作用，导致不同的共振条件的动态磁化率组件。我们预测，分裂的自旋共振双峰变得强非线性较大的领域时，两个分裂组件的能量降低。对于沿四极轴的场，没有分裂，只有共振的加宽，这与实验一致。
英文摘要：
We investigate the spin-exciton modes in the superconducting d_{x^2-y^2} state of CeMIn_5 heavy fermion compounds found at the antiferromagnetic wave vector by inelastic neutron scattering. We present a theoretical model that explains the field dependence for both field directions. We show that the recently observed splitting of the spin exciton doublet in CeCoIn_5 into two non-degenerate modes for in-plane field appears naturally in this model. This is due to the spin anisotropy of g- factors and quasiparticle interactions which lead to different resonant conditions for the dynamic susceptibility components. We predict that the splitting of the spin resonance doublet becomes strongly nonlinear for larger fields when the energy of both split components decreases. For field along the tetragonal axis no splitting but only a broadening of the resonance is found in agreement with experiment.
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