Effect of iodine intercalation on superconductivity in the high-Tc series Bi2Sr2CaN-1CuNO2N+4+δ, N = 1,2 and 3, and in the yttrium doped N = 2 compound. An indirect exchange analysis

Laurens Jansen and Ruud Block

Physica A: Statistical Mechanics and its Applications, 1993, vol. 198, issue 3, 551-572

Abstract: A quantitative analysis is presented of the effect on critical temperatures of iodine intercalation in the (Bi-O)2 bilayers of the bismuth cuprates with N = 1,2 and 3 CuO2 layers per molecular unit, as well as of the N = 2 system Bi2Sr2Ca1-xYxCu2O8+δ with varying yttrium doping. The formalism used is that of indirect exchange pairing between conduction electrons via closed-shell oxygen anions. For the N = 1,2 and 3 undoped systems, quantitative agreement with experiment results from supposing that iodine intercalation leads to a migration of interstitially stored oxygens, implying an increase near CuO2 layers of one oxygen anion per molecular unit. For the yttrium-doped N = 2 system, detailed agreement with experimental results for both the pristine and iodine-intercalated materials is achieved. The results strongly indicate that neither an increase of hole concentration in the CuO2 layers, nor weakened inter-cell coupling between these layers, as a result of intercalation, is the cause of the phenomena observed.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:198:y:1993:i:3:p:551-572

DOI: 10.1016/0378-4371(93)90240-5

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