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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/4230

Advisors: prof. P.Singh
Keywords: iron-based layere
rare earth ternary compounds
Copyright: Jun-2011
Date Added: 8-Dec-2012
Publisher: A.A.U
Abstract: Superconductivity and magnetism were previously thought as incompatible until the dis- covery of some rare earth ternary compounds that shows the coexistence of superconduc- tivity and magnetism. In some of the recently discovered iron-based layere. Superconduc- tivity and magnetic order system are coexist, that occur in only 11 and 122 family. The present work we examine the possibility of coexistence of superconductivity and disorder of magnetic spin is called spin glass, when freeze the system that can show the supercon- ductivity and spin glass coexist. In this present work we can examine the possibility of coexistence of superconductivity and spin glass in detailed 11 family of Fe1+Y SeXTe1􀀀X compound. We show that spin glass like behavior is present in FST for b/n X=0.1 and X= 0.15. We present evidence form magnetization measurement and characterized the short- range order with neutron scattering. One of our main results in the short-range order depend on structural as well as magnetic order. The factor of magnetic order exchange in long range depend on temperature, pressure, number of doping and other external factor discussed it. We found mathematical expression for superconductor transition TC, spin glass temperature Tg, Susceptibility X(q) and retardation time using for born approxi- mation and digamma function depend on wave vector(q) and cut o frequency(!) in the region coexistence of superconductivity and spin glass in Fe1+Y SeXTe1􀀀X compound.
Description: A Thesis Submitted to the School of Graduate Studies Addis Ababa University in Partial Ful_llment of the Requirement for the Degree of Master of Science in Physics
URI: http://hdl.handle.net/123456789/4230
Appears in:Thesis - Physics

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