Alvarez J V, Yndurain Felix
Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
Phys Rev Lett. 2007 Mar 23;98(12):126406. doi: 10.1103/PhysRevLett.98.126406. Epub 2007 Mar 22.
We discuss the fixed-point Hamiltonian and the spectrum of excitations of a quasi-bidimensional electronic system supporting simultaneously antiferromagnetic ordering and superconductivity. The coexistence of these two order parameters in a single phase is possible because the magnetic order is linked to the formation of a metallic spin density wave, and its order parameter is not associated to a spectral gap but to an energy shift of the paramagnetic bands. This peculiarity entails several distinct features in the phase diagram and the spectral properties of the model, which may have been observed in CeRhIn5. Apart from the coexistence, we find an abrupt suppression of the spin density wave when the superconducting and magnetic ordering temperatures are equal. The divergence of the cyclotron mass extracted from de Haas-van Alphen experiments is also analyzed in the same framework.
我们讨论了同时支持反铁磁序和超导性的准二维电子系统的定点哈密顿量和激发谱。这两个序参量在单一相中能够共存，是因为磁序与金属自旋密度波的形成相关联，并且其序参量并非与能隙相关，而是与顺磁能带的能量偏移有关。这种特性在相图和模型的光谱特性中带来了几个不同的特征，这些特征可能在CeRhIn5中已经被观测到。除了共存现象，我们还发现当超导温度和磁有序温度相等时，自旋密度波会突然被抑制。在相同框架下，我们还分析了从德哈斯 - 范阿尔芬实验中提取的回旋质量的发散情况。
