Decoupled CuO_2 and RuO_2 layers in superconducting and magnetically ordered RuSr_2GdCu_2O_8

Požek, Miroslav and Dulčić, Antonije and Paar, Dalibor and Hamzić, Amir and Basletić, Mario and Tafra, Emil and Williams, G. V. M. and Kramer, S. (2002) Decoupled CuO_2 and RuO_2 layers in superconducting and magnetically ordered RuSr_2GdCu_2O_8. Physical Review B, 65 (17). pp. 174514-10. ISSN 1098-0121

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Abstract

Comprehensive measurements of dc and ac susceptibility, dc resistance, magnetoresistance, Hall resistivity, and microwave absorption and dispersion in fields up to 8 T have been carried out on RuSr_2GdCu_2O_8 with the aim to establish the properties of RuO_2 and CuO_2 planes. At ∼130 K, where the magnetic order develops in the RuO_2 planes, one observes a change in the slope of dc resistance, change in the sign of magnetoresistance, and the appearance of an extraordinary Hall effect. These features indicate that the RuO2 planes are conducting. A detailed analysis of the ac susceptibility and microwave data on both ceramic and powder samples show that the penetration depth remains frequency dependent and larger than the London penetration depth even at low temperatures. We conclude that the conductivity in the RuO_2 planes remains normal even when superconducting order is developed in the CuO_2 planes below ∼45 K. Thus, experimental evidence is provided in support of theoretical models which base the coexistence of superconductivity and magnetic order on decoupled CuO_2 and RuO_2 planes.

Item Type: Article
Keywords: strontium compounds, ruthenium compounds, gadolinium compounds, high-temperature superconductors, magnetic susceptibility, electrical resistivity, magnetoresistance, Hall effect, penetration depth (superconductivity), high-frequency effects, ferromagnetic
Date: April 2002
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2002) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 0119251, 0119275
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 May 2014 07:32
Last Modified: 23 May 2014 07:32
URI: http://digre.pmf.unizg.hr/id/eprint/1623

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