High-temperature ceramic oxide superconductors

Rao, CNR (1988) High-temperature ceramic oxide superconductors. In: Sadhana, 13 (1-2). pp. 19-35.

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Abstract

High-temperature superconductivity in oxides of the type $La_{2-x}Ba_x(Sr_x)CuO_4$, $YBa_2Cu_30_{7-\delta}$, $La_{3-x}Ba_{3+x}Cu_60_{14}$ and Bi (Tl)- Ca-Sr(Ba)-Cu-0 systems is discussed, with special emphasis on the experimental findings from the author's laboratory. The importance of holes on oxygen and of the $Cu^{1+} (d^{10})$ state is examined. A transition is shown to occur from chain- to sheet-superconductivity in $YBa_2CU_3O_{7-\delta}$ accompanying a change in oxygen stoichiometry. Some of the important material parameters and technological applications are briefly presented. There is every hope that materials with $T_c$ close to room temperature will be discovered in the near future. All the high $T_c$ oxides found hitherto have perovskite-related structures with two-dimensional Cu-0 sheets.

Item Type:	Journal Article
Publication:	Sadhana
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	High-temperature superconductivity;ceramic oxide superconductors;bismuth cuprates;thallium cuprates;LnBa2Cu307;rare earth cuprates
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	07 Mar 2008
Last Modified:	19 Sep 2010 04:43
URI:	http://eprints.iisc.ac.in/id/eprint/13194

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