The effect of the Ca/Ba ratio on the superconductivity of the La3CaχBa4−χCu7Oy system

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Title:	The effect of the Ca/Ba ratio on the superconductivity of the La3CaχBa4−χCu7Oy system
Authors:	Wu, D. S.;Yang, Y. F.;Kao, H. -C. I.;Wang, C. M.
Contributors:	淡江大學化學學系
Date:	1993-07
Issue Date:	2013-07-09 15:26:33 (UTC+8)
Publisher:	Amsterdam: Elsevier BV * North-Holland
Abstract:	A series of samples with nominal composition of La3CaχBa4−χCu7Oy (0≤χ≤4.00) was prepared by the conventional powder reaction method. Single-phase materials with triple-perovskite structure were obtained for χ≤1.25 samples of which the lattice parameters monotonically decreased with the increase of Ca substitution. Superconductivity was observed for χ≤3.50 samples with 37 K≤Tconset≤86 K. A Tc plateau above 80 K was found in the 1.00≤χ≤1.25 samples with a-axis length of 3.879≥a≥3.872 Å. In other words, an optimal rCu-O distance of ca. 1.94 Å in the Cu-O planes was the most appropriate value for superconductivity in the La3CaχBa4−χCu7Oy system.
Relation:	Physica C: Superconductivity 212(1-2), pp.32-36
DOI:	10.1016/0921-4534(93)90482-6
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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