Structure-properties relationship in ferromagnetic superconducting RuSr2GdCu2O8
O. I. Lebedev, G. Van Tendeloo, G. Cristiani, H.-U. Habermeier, A. T. Matveev
DOI 10.1103/PhysRevB.71.134523 · Physical Review B
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Abstract
RuSr2GdCu2O8 films with a different thickness are grown by pulsed laser deposition on a (100) STO substrate at 750 °C and an oxygen background pressure of 5×10−3Pa. The film structure is characterized by x-ray diffraction, Raman spectroscopy and transmission electron microscopy (TEM), and correlated with the physical properties. All films exhibit ferromagnetic ordering at temperatures around 130 K, however not all films show superconductivity. TEM reveals that superconductivity in the films is related to the presence of an orthorhombic Ru-1212 phase with unit cell parameters √2at×√2at×2ct. A model considering Cu substitution at Ru positions within the RuO2 layer is proposed. The structure of the orthorhombic Ru-1212 with a doubled c axis can be described as a periodic alteration of superconducting Ru1−xCuxSr2GdCu2O8−δ layers and ferromagnetic RuSr2GdCu2O8 layers. The structure in the thin film is strain induced, but there is a high probability that it will exist in bulk as well.
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. | 48 | Pressure not reported | unknown |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | unknown |
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