Degree Type

Dissertation

Date of Award

1986

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

Abstract

The present investigation focuses on the nature and mechanism of superconductivity in the cerium-containing ternary borides and silicides: CeRu(,3)B(,2), CeOs(,3)B(,2), and CeRu(,3)Si(,2). These are the only ternary cerium compounds where "conventional" (as opposed to heavy fermion) superconductivity has been observed to date;The closely related crystal structures (all related to the CeCo(,3)B(,2)-type, P6/mmm) enabled the study of the effect on superconductivity of transforming continuously from one system to the other by going across the pseudoternary series Ce (Ru(,1-x)Os(,x))(,3)B(,2) and CeRu(,3)- (B(,x)Si(,1-x))(,2). These pseudoternary systems were subjected to high external pressures using a standard hydrostatic pressure clamp for lower pressures (up to 20 kbar) and a specially designed diamond anvil cell for higher pressures (up to 66 kbar). Trends are presented for the variation of the superconducting transition temperatures with changes in external pressure;Results are also included from measurements of static magnetic susceptibility and electrical resistivity of all of the materials in the;series Ce(Ru(,1-x)Os(,x))(,3)B(,2) and CeRu(,3)(B(,x)Si(,1-x))(,2). These provide some insight into the nature of the cerium valence in these compounds; *DOE Report IS-T-1216. This work was performed under contract No. W-7405-Eng-82 with the U.S. Department of Energy.

DOI

https://doi.org/10.31274/rtd-180813-13000

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Krishna Siddhanta Athreya

Language

en

Proquest ID

AAI8703684

File Format

application/pdf

File Size

92 pages

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