Magnetic interactions and electronic states in superconducting and nonsuperconducting ruthenocuprates

Y. Hirai; I. Živkovic; B. H. Frazer; A. Reginelli; L. Perfetti; D. Ariosa; G. Margaritondo; M. Prester; D. Drobac; D. T. Jiang; Y. Hu; T. K. Sham; I. Felner; M. Pederson; M. Onellion

doi:10.1103/PhysRevB.65.054417

Magnetic interactions and electronic states in superconducting and nonsuperconducting ruthenocuprates

Y. Hirai, I. Živkovic, B. H. Frazer, A. Reginelli, L. Perfetti, D. Ariosa, G. Margaritondo, M. Prester, D. Drobac, D. T. Jiang, Y. Hu, T. K. Sham, I. Felner, M. Pederson, M. Onellion

DOI 10.1103/PhysRevB.65.054417 · Physical Review B

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Abstract

We measured polycrystalline samples of SrRuO3 and both superconducting and nonsuperconducting (hydrogen loaded) ruthenocuprates–Eu1.5Ce0.5RuSr2Cu2O10−x (Ru-1222)–samples using ac susceptibility, Ru 3p x-ray photoemission and Ru 2p x-ray-absorption measurements. The superconducting-and metallic-ruthenocuprate samples exhibit significant ferromagnetic fluctuations above the highest magnetic ordering temperature. The (Ru 3p) core level of the SrRuO3, and superconducting ruthenocuprate samples indicate that the (Ru) layers are metallic.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Eu1.5Ce0.5RuSr2Cu2O10-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
Eu1.5Ce0.5Sr2RuCu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown