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

Manuel Houzet; Alexandre Buzdin; Miodrag L. Kulic

doi:10.1103/PhysRevB.64.184501

paper

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

arXiv:cond-mat/0105480 · doi:10.1103/PhysRevB.64.184501

Abstract

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. , 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 $H_{c 1}$ , 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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Superconductivity in Ru(1-x)Sr2GdCu(2+x)O(8-y) Compounds

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

Abstract

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