Vortex Core Excitations in Superconductors with Frustrated Antiferromagnetism

Details Vortex Core Excitations in Superconductors with Frustrated Antiferromagnetism Vortex Core Excitations in Superconductors with Frustrated Antiferromagnetism

2003-06-10

arxiv.org/abs/cond-mat/0306253v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

Motivated by recent discovery of cobalt oxide and organic superconductors, we apply an effective model with strong antiferromagnetic and superconducting pairing interaction to a related lattice structure. It is found that the antiferromagnetism is highly frustrated and a broken-time-reversal-symmetry chiral $d+id^{\prime}$-wave pairing state prevails. In the mixed state, we have solved the local electronic structure near the vortex core and found no local induction of antiferromagnetism. This result is in striking contrast to the case of copper oxide superconductors. The calculated local density of states indicates the existence of low-lying quasiparticle bound states inside the vortex core, due to a fully gapped chiral pairing state. The prediction can be directly tested by scanning tunneling microscopy.

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