Magnetic and lattice coupling in single-crystal SrFe${}_2$As${}_2$: A neutron scattering study

Abstract

A detailed elastic neutron scattering study of the structural and magnetic phase transitions in single-crystal SrFe${}_2$As${}_2$ reveals that the orthorhombic (O)-tetragonal (T) and the antiferromagnetic transitions coincide at $T_{\text{O}}$ = $T_{\text{N}}$ = (201.5 $\pm$ 0.25) K. The observation of coexisting O-T phases over a finite temperature range at the transition and the sudden onset of the O distortion provide strong evidences that the structural transition is first order. The simultaneous appearance and disappearance within 0.5 K upon cooling and within 0.25 K upon warming, respectively, indicate that the magnetic and structural transitions are intimately coupled. We find that the hysteresis in the transition temperature extends over a 1-2 K range. Based on the observation of a remnant orthorhombic phase at temperatures higher than \emph{T}${}_{\text{O}}$, we suggest that the T-O transition may be an order-disorder transition.

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