Decoupled CuO2 and RuO2 layers in superconducting and magnetically ordered RuSr2GdCu2O8

M. Požek; A. Dulčić; D. Paar; A. Hamzić; M. Basletić; E. Tafra; G. V. M. Williams; S. Krämer

doi:10.1103/PhysRevB.65.174514

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Decoupled CuO2 and RuO2 layers in superconducting and magnetically ordered RuSr2GdCu2O8

M. Požek, A. Dulčić, D. Paar, A. Hamzić, M. Basletić, E. Tafra, G. V. M. Williams, S. Krämer

DOI 10.1103/PhysRevB.65.174514 · Physical Review B

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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 RuSr2GdCu2O8 with the aim to establish the properties of RuO2 and CuO2 planes. At ∼130 K, where the magnetic order develops in the RuO2 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 RuO2 planes remains normal even when superconducting order is developed in the CuO2 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 CuO2 and RuO2 planes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	onset
RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	47	Pressure not reported	onset
RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	onset
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown