Interlayer spin-singlet pairing induced by magnetic interactions in an antiferromagnetic superconductor

Abstract

It is shown that interlayer spin-singlet Cooper pairing is induced by magnetic interactions in a metallic antiferromagnet of stacked conductive layers in which each layer is ferromagnetically polarized and they order antiferromagnetically in stacking direction. As a result, the antiferromagnetic long-range order and superconductivity coexist at low temperatures. It is shown that T_AF > T_c except for in a very limited parameter region unless T_AF = 0, where T_AF and T_c denote the antiferromagnetic and superconducting transition temperatures, respectively. It is found that the exchange field caused by the spontaneous staggered magnetization does not affect superconductivity at all, even if it is very large. The resultant superconducting order parameter has a horizontal line node, and is isotropic in spin space in spite of the anisotropy of the background magnetic order. We discuss the possible relevance of the present mechanism to the antiferromagnetic heavy fermion superconductors UPd_2Al_3 and CePt_3Si.

5 pages, 3 figures, in revtex4

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Cited by in corpus (5)

• Superconductivity and Magnetism in Non-centrosymmetric System: Application to CePt_3Si
• Non-centrosymmetric Superconductivity and Antiferromagnetic Order: Microscopic discussion of CePt${}_3$Si
• Spin response and topology of a staggered Rashba superconductor
• Fulde-Ferrell-Larkin-Ovchinnikov State in Perpendicular Magnetic Fields in Strongly Pauli-Limited Quasi-Two-Dimensional Superconductors
• A new model and its physics