Evidence for a vortex-glass transition in superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$

Abstract

Measurements of magneto-resistivity and magnetic susceptibility were performed on single crystals of superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$ close to the conditions of optimal doping. The high quality of the investigated samples allows us to reveal a dynamic scaling behaviour associated with a vortex-glass phase transition in the limit of weak degree of quenched disorder. Accordingly, the dissipative component of the ac susceptibility is well reproduced within the framework of Havriliak-Negami relaxation, assuming a critical power-law divergence for the characteristic correlation time $\tau$ of the vortex dynamics. Remarkably, the random disorder introduced by the Fe${}_{1-x}$Co${}_x$ chemical substitution is found to act on the vortices as a much weaker quenched disorder than previously reported for cuprate superconductors such as, e.g., Y${}_{1-x}$Pr${}_x$Ba${}_2$Cu${}_3$O${}_{7-\delta }$.

10 pages, 8 figures

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