A correlation between the Tc and hole concentration of La3CaxBa4−xCu7Oy superconductors

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Title:	A correlation between the Tc and hole concentration of La3CaxBa4−xCu7Oy superconductors
Authors:	Kao, H.-C. I.;Wu, D. S.;Wu, M. K.;Wang, C. M.
Contributors:	淡江大學化學學系
Date:	1994-03
Issue Date:	2013-07-09 15:27:01 (UTC+8)
Publisher:	Amsterdam: Elsevier BV * North-Holland
Abstract:	A series of samples with nominal compositions of La3CaxBa4-xCu7Oy,(0 <= x <= 4.00) was prepared by the solid state reaction method. Single phase materials were obtained for 0 <= x <= 1.25 samples which had an oxygen stoichiometry, 16.021 <= y <= 16.587, equivalent to 6.866 <= z <= 7.109 per unit cell with a formula of La1.29Ca0.43xBa1.71-0.43xCu3Oz. An evidence of the hole doping was observed by substituting Ca ions for Ba ions. It was interesting that increasing the Ca substitution accompanied an increase in the oxygen stoichiometry to a maximum value of 7.109 with a hole concentration of 0.311 for x = 1.00 sample. A correlation between the Tc and the hole concentration was plotted and the result was very similar to that found in the YBa2Cu3O7-x superconductor.
Relation:	Physica B: Condensed Matter 194-196(2), pp.2165-2166
DOI:	10.1016/0921-4526(94)91582-2
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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