Study Of Fluctuation Effect On Electrical Conductivity And Magnetic Susceptibility Of Spin Glass Superconductors

The fluctuation effect on electrical conductivity and magnetic susceptibility of spinglassrnsuperconductor are studied using the macroscopic generalized Ginzburg-Landaurntheory. A free energy functional that consists of spin glass (g) and superconductingrn( ) order parameters and their coupling is used to show the influence of spin glassrnmagnetic ordering on superconducting cooper pairs and vice versa. It is found thatrnduring coupling of spin glass and superconductor, cooper pairs begin to break byrnfreezing of spins in spin glass and the spins from the pair participate in the processrnof magnetization so that to increase the magnetic susceptibility of spin glass superconductorrnuntil spin glass and superconductor coexist. In the coexistence region thernsusceptibility is less than pure spin glass system. The electrical conductivity of spinrnglass superconductor is also affected by the rise of spin glass transition, which leadsrnto the decrease of the superconducting order parameter and the cooper pair density.rnConsequently the electrical conductivity is decreased

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