Staggered flux vortices and the superconducting transition in the layered cuprates

Details Staggered flux vortices and the superconducting transition in the layered cuprates Staggered flux vortices and the superconducting transition in the layered cuprates

2003-09-19

arxiv.org/abs/cond-mat/0309469v1

Phys. Rev. Lett. 92, 177002 (2004)

Physics

Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.177002

We propose an effective model for the superconducting transition in the high-T_c cuprates motivated by the SU(2) gauge theory approach. In addition to variations of the superconducting phase we allow for local admixture of staggered flux order. This leads to an unbinding transition of vortices with staggered flux core that are energetically preferable to conventional vortices. Based on parameter estimates for the two-dimensional t-J model we argue that the staggered flux vortices provide a way to understand a phase with a moderate density of mobile vortices over a large temperature range above T_c that yet exhibits otherwise normal transport properties. This picture is consistent with the large Nernst signal observed in this region.

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