Preparation, Superconducting and Normal State Transport Properties of Granular, n-Doped Ln2-xCexCuO4-δ, Ln=Nd, Sm
- 1 August 1990
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 29 (8R)
- https://doi.org/10.1143/jjap.29.1439
Abstract
We report on superconducting and normal state transport properties of the electron-doped cuprates Ln2-x Ce x CuO4-δ with Ln=Nd, P Sm. Irreversible behaviour of bulk samples after applying a magnetic field at low temperatures is observed. This feature as well as the two step transition in R(T) and the `semiconducting' behaviour of the polycrystalline samples above T c is explained in terms of granularity. Phase-diagrams for both Nd2-x Ce x CuO4-δ and Sm2-x Ce x CuO4-δ are presented. There is evidence for a solubility limit of Ce-ions in Sm2CuO4 within the superconducting concentration range. We show results for the Hall-coefficient, which is negative all over the investigated temperature range. The preparation process has been monitored by means of X-ray analysis and TGA/DTA.Keywords
This publication has 20 references indexed in Scilit:
- Magnetic properties of Ln2−xCexCuO4−δ(Ln=Nd, Pr, Sm) in the superconducting and normal-conducting statePhysica C: Superconductivity and its Applications, 1990
- Electronic Structure of Nd
2-
x
Ce
x
CuO 4-δ Studied by Photoelectron SpectroscopyEurophysics Letters, 1989
- Spectroscopic, transport, and magnetic results on thesystems (A=Ce and Th)Physical Review B, 1989
- Effect of Ce doping on the Cu charge in the electron superconductorPhysical Review B, 1989
- Valence State of Cu in Nd2-xCexCuO4 SystemJapanese Journal of Applied Physics, 1989
- Growth and anisotropic superconducting properties of Nd2–xCexCu04–y single crystalsNature, 1989
- Superconductivity at 27 K in fluorine-doped Nd2Cu04Nature, 1989
- A superconducting copper oxide compound with electrons as the charge carriersNature, 1989
- Electron doping tests theoriesNature, 1989
- Electron transport properties of transition metal oxide systems with the K2NiF4 structureMaterials Research Bulletin, 1973