Collective Spin Modes in Superconducting Double Layers

Details Collective Spin Modes in Superconducting Double Layers Collective Spin Modes in Superconducting Double Layers

1996-06-18

arxiv.org/abs/cond-mat/9606135v1

Physics

Condensed Matter

7 pages, latex, 2 postscript figures

Scientific paper

10.1007/BF00768464

We investigate a double layer system with tight-binding hopping, intra-layer and inter-layer interactions, as well as a Josephson like coupling. We find that an antiferromagnetic spin polarization induces additional spin-triplet pairing (with $S_z =0$) to the singlet order parameter. This causes an undamped collective mode in the superconducting state below the particle-hole threshold, which is interpreted as a Goldstone excitation.

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