Structure and microstructure of the ferromagnetic superconductor RuSr2GdCu2O8
A. C. McLaughlin, W. Zhou, J. P. Attfield, A. N. Fitch, J. L. Tallon
DOI 10.1103/PhysRevB.60.7512 · Physical Review B
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Abstract
Two samples of RuSr2GdCu2O8, in which ferromagnetism and superconductivity coexist at low temperatures, have been studied by high-resolution electron microscopy and synchrotron x-ray-diffraction methods. The average crystal structure is tetragonal at both 10 and 295 K, but a superstructure resulting from coherent rotations of the RuO6 octahedra within subdomains of 50–200 Å are observed by electron diffraction. The Cu-O bond distances indicate a high hole concentration (p≈0.4) in the CuO2 planes, which is inconsistent with the previously observed underdoped transport properties (p≈0.1). This may reflect extensive hole trapping by the Ru moments.
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. | 20 | Pressure not reported | zero_resistance |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | zero_resistance |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | midpoint |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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