The study of Coexistence of Superconductivity and Spin Glass in Iron Pnictide(Fe1+Y SeXTe1X)
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Date
2011-06
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Addis Ababa University
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 SeXTe1X
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 SeXTe1X compound
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Keywords
Superconductivity and Magnetism