Study of Fluctuation Effect on Electrical Conductivity and Magnetic Susceptibility of Spin Glass Superconductors
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Date
2007-04
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Addis Ababa University
Abstract
The fluctuation effect on electrical conductivity and magnetic susceptibility of spinglass
superconductor are studied using the macroscopic generalized Ginzburg-Landau
theory. A free energy functional that consists of spin glass (g) and superconducting
( ) order parameters and their coupling is used to show the influence of spin glass
magnetic ordering on superconducting cooper pairs and vice versa. It is found that
during coupling of spin glass and superconductor, cooper pairs begin to break by
freezing of spins in spin glass and the spins from the pair participate in the process
of magnetization so that to increase the magnetic susceptibility of spin glass superconductor
until spin glass and superconductor coexist. In the coexistence region the
susceptibility is less than pure spin glass system. The electrical conductivity of spin
glass superconductor is also affected by the rise of spin glass transition, which leads
to the decrease of the superconducting order parameter and the cooper pair density.
Consequently the electrical conductivity is decreased
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Effect on Electrical Conductivity