Decoupling of superconducting layers in magnetic superconductor RuSr_{2}GdCu_{2}O_{8}

Details Decoupling of superconducting layers in magnetic superconductor RuSr_{2}GdCu_{2}O_{8} Decoupling of superconducting layers in magnetic superconductor RuSr_{2}GdCu_{2}O_{8}

2001-05-24

arxiv.org/abs/cond-mat/0105480v1

Physics

Condensed Matter

Superconductivity

12 pages, 3 figs embeded

Scientific paper

10.1103/PhysRevB.64.184501

We propose the model for magnetic properties of the magnetic superconductor RuSr$_{2}$GdCu$_{2}$O$_{8}$, which incorporates the theory of the superconducting/ferromagnetic multilayers. The transition line $T_{d}(h)$, on which the Josephson coupled superconducting planes are decoupled, i.e. $% j_{c}(T_{d})=0$, is calculated as a function of the exchange energy $h$. As the result of this decoupling a nonmonotonic behavior of magnetic properties, like the lower critical field $H_{c1}$, Josephson plasma frequency, etc. is realized near (or by crossing) the $T_{d}(h)$ line. The obtained results are used in analyzing the newly discovered antiferromagnetic ruthenocuprate RuSr$_{2}$GdCu$_{2}$O$_{8}$ with possible weak ferromagnetic order in the RuO planes.

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