Abstract
Due to relatively lower superconducting transition temperature(Tc), weaker anisotropy and larger coherence length, the overall strength of thermal fluctuations in iron-based superconductors seem to be intermediate between cuprates and more classical superconductors like Nb3Sn. A detailed linear and non-linear ac magnetic susceptibility technique has been used as a probe to investigate the vortex-glass melting transition and vortex dynamics in an optimally doped p-type Ba0.54K0.46Fe2As2 good quality single crystal (RRR≈10) under various fields and frequency range. Besides these, we have also constructed a vortex phase diagram in this compound using dc magnetization. Magnetic irreversibility temperature (Tirr) is the only temperature where solid vortex phase shows true zero resistance and has a great importance for technical applications of a superconductor. We have clearly observed that Tirr strongly depends on frequency and this dependency can be explained in the framework of vortex-glass phase transition model. From our experimental observations, we conclude that vortex-glass melting transition is second order in nature and vortex phase shows glassy character in this compound.
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