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We measure magnetization as a function of temperature, magnetic field andtime in a BaFe$_2$(As$_{0.68}$P$_{0.32}$)$_2$ single crystal with $T_c$ = 27.6K. The fish-tail observed on many $M$($H$) curves are used to constructisofield $M$($T$) curves which show an anomalous peak at some temperature $Tt$suggesting a possible phase transition in the irreversible regime. A vortexdynamics study performed along the peaks evidences a minimum in the relaxationrate occurring at the same position $Tt$ of the minimum value of $M$ in thesepeaks. A vortex dynamics study performed on $M$($H$) curves show two distinctminimum in the relaxation rate: a first minimum ($H1$) for a lower fieldcorrelating with $Tt$ and a second ($H2$) correlating with the peak in thefish-tail. A phase diagram is constructed and the line corresponding to $Tt$and $H1$ points obey an expression developed in the literature for a structuralrhombic to square lattice phase transition, further supporting this view.

superconductor science and technology/superconductor science and technology

Experimental observation of an anomalous peak in isofield M(T) curves in  BaFe$_2$(As$_{1-x}$P$_x$)$_2$ resembling the fish-tail in $M$($H$) curves  further suggesting a possible phase transition in the irreversible regime