Magnetic properties of pure, Sr- and Ca-Doped La2NiO4+δ ceramics: Onset of high-Tc superconductivity

Nanjundaswamy, KS and Lewicki, A and Kakol, Z and Gopalan, P and Metcalf, P and Honig, JM and Rao, CNR and SpaŁek, J (1990) Magnetic properties of pure, Sr- and Ca-Doped La2NiO4+δ ceramics: Onset of high-Tc superconductivity. In: Physica C: Superconductivity, 166 (3-4). pp. 3613-371.

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Abstract

We present the results for the temperature and field dependence of the magnetic for ceramic materials of the composition La2−xMxNiO4, with M=Sr or Ca and 0≤x≤0.4. The onset of a strong diamagnetism has been observed at temperatures between 8 and 70 K, depending on sample composition, annealing conditions. and thermal cycling procedures. The results are similar to those obtained earlier for monocrystalline samples and are likewise interpreted as due to the onset of superconductivity in a minority phase. A comparison with the results for superconducting La1.8Sr0.2Cu0.9Ni0.1O4 ceramics is also made; this illustrates some unique features of the nickelate systems, such as the high values of the critical fields Hc1 and Hc2. The differences between monocrystalline and ceramic systems are also discussed.

Item Type:	Journal Article
Publication:	Physica C: Superconductivity
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science .
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 Apr 2011 04:45
Last Modified:	27 Apr 2011 04:45
URI:	http://eprints.iisc.ac.in/id/eprint/35041

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