Decoupled CuO_2 and RuO_2 layers in superconducting and magnetically ordered RuSr_2GdCu_2O_8

Scientific paper - Original scientific paper

• Author: Miroslav Požek
• Author: Antonije Dulčić
• Author: Dalibor Paar
• Author: Amir Hamzić
• Author: Mario Basletić
• Author: Emil Tafra
• Author: G. V. M. Williams
• Author: S. Kramer
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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.

• Keywords (english): strontium compounds; ruthenium compounds; gadolinium compounds; high-temperature superconductors; magnetic susceptibility; electrical resistivity; magnetoresistance; Hall effect; penetration depth (superconductivity); high-frequency effects; ferromagnetic
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical review B: Condensed matter and materials physics
• Numbering: vol. 65, no. 17, pp. 174514-10
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.65.174514
• URN:NBN: urn:nbn:hr:217:395415
• Publication: 2002
• Document URL: http://link.aps.org/doi/10.1103/PhysRevB.65.174514
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2002) by the American Physical Society.
• Created on: 2019-10-13 11:55:04