Journal ArticleDOI
Effect of Zn, Ga and Ni substitution on the superconducting properties of the electron doped system Nd-Ce-Cu-O
Israel Felner,D. Hechel,U. Yaron +2 more
TLDR
In this paper, experimental data about the influence of Zn, Ga and Ni substitution of T c of the electron doped system Nd 1.85 Ce 0.15 Cu 1- y M y O 4- δ, 0≤ y ≤ 0.01, 0.03 and 0.05 for M= Ni, Ga, Zn respectively.Abstract:
We report experimental data about the influence of Zn, Ga and Ni substitution of T c of the electron doped system Nd 1.85 Ce 0.15 Cu 1- y M y O 4- δ , 0≤ y ≤0.15. The relative suppression of T c for a given dopant concentration decreases from Ni to Ga to Zn. Superconductivity is totally suppressed above y =0.01, 0.03 and 0.05 for M= Ni, Ga, Zn, respectively. The solubility of M=Fe in the matrix is extremely small. The effect of M=Ga 3+ on T c is similar to that of Ce 4+ . We compare doping results for magnetic and nonmagnetic ions and discuss the origin of the depression of T c . The effect of these dopants on T c in the Nd-Ce-Cu-O system is completely diffrent from that observed in the La-Sr-Cu-O system.read more
Citations
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Origin of high-temperature superconductivity in copper oxides - clues from the normal-state resistivity
TL;DR: In this article, the in-plane resistivity data, ϱ ∥ (T ), as a function of temperature for various Cu-oxide superconductors have provided strong evidence for Fermi-liquid normal state and also important clues for understanding the mechanism responsible for high-temperature superconductivity.
Journal ArticleDOI
YBa2Cu3O7- delta single-crystal microstructure related to transport critical current density
TL;DR: In this paper, the structure of YBa2Cu3O7-Delta single crystals has been investigated by means of high-resolution electron microscopy and the cooperative growth of a number of spirals causes the interference of stresses and the formation of microblocks.
Journal ArticleDOI
Crystal growth of high-TC superconductors Pr2 − xCexCuO4 + δ with substitutions of Ni and Co for Cu
TL;DR: In this paper, the authors reported the crystal growth of the electron-doped high-TC superconducting Pr2 − xCexCuO4 + δ by a modified CuO self-flux flow method.
Journal ArticleDOI
Thermoelectric properties of Ni- and Zn-doped Nd2CuO4
TL;DR: In this article, the electrical resistivity, Seebeck coefficient, and thermal conductivity of Nd 2 (Cu 0.98 M 0.02 )O 4 (M: Ni and Zn) have been measured in the temperature range from room temperature to about 1000 K.
Journal ArticleDOI
TEM observation and Hall measurements on superconductive Nd2CuO4−xFx
TL;DR: In this article, structural and transport properties of polycrystalline superconductive Nd 2 CuO 4− x F x samples were reported, and it was shown that the fluorine content of the samples decreases to about 85% of the nominal content after sintering at 1100°C.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
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Possible high Tc superconductivity in the Ba-La-Cu-O system
TL;DR: In this paper, Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form, and samples with x=1 and 0.75,y>0, annealed below 900°C under reducing conditions, consist of three phases, one of them a perovskite-like mixed-valent copper compound.
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Electronic band properties and superconductivity in La2-yXyCuO4.
TL;DR: The results of electronic-structure calculations for tetragonal La/ sub 2/CuO/sub 4/ provide insight concerning the origin of high-temperature superconductivity in the La/sub 2-//sub y/X/ sub y/ CuO/ sub 4/ alloys.
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Superconductivity produced by electron doping in CuO 2 -layered compounds
TL;DR: It is discovered that the Ce4+doping and subsequent annealing in reducing atmosphere give rise to 24-K superconductivity in the Nd2CuO4-type structure with sheets of Cu-O squares, in contrast to the previously reported high-Tccuprates.
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Spin Exchange in Superconductors
TL;DR: In this paper, small amounts of the magnetic rare earths were dissolved in lanthanum and the effects on the superconducting transitions were shown, and the results were shown graphically.