The Ruthenocuprates - Natural Superconductor-Ferromagnet Multilayers
T. Nachtrab, C. Bernhard, C.T. Lin, D. Koelle, and R. Kleiner
TL;DR
This paper reviews the crystallographic, magnetic, and superconducting properties of ruthenocuprates, materials that uniquely exhibit coexistence of superconductivity and ferromagnetism at different temperature ranges.
Contribution
It provides a comprehensive summary of experimental findings on the structural, magnetic, and superconducting characteristics of ruthenocuprates.
Findings
Superconductivity occurs in CuO2 layers at 15-50 K.
Magnetic order in RuO2 layers appears around 125-145 K.
Coexistence of superconductivity and ferromagnetism is observed.
Abstract
The recently discovered ruthenocuprates have attracted great interest because of the microscopic coexistence of superconducting and ferromagnetic order. Typically, these materials become magnetically ordered at temperatures around 125-145 K and superconductivity sets in between 15 and 50 K. While superconductivity arises in the CuO2 layers the RuO2 layers in between order magnetically. In this paper we summarize some of the crystallographic, magnetic and superconducting properties of the ruthenocuprates, as obtained from investigations on polycrystalline samples as well as single crystals.
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