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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Cited by in corpus (15)

• Superconductivity in Iron Compounds
• Magnetism in Fe-based superconductors
• Effect of tensile stress on the in-plane resistivity anisotropy in BaFe2As2
• Distinct high-T transitions in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Phase transitions and iron-ordered moment form factor in LaFeAsO
• Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(Fe${}_{0.953}$Co${}_{0.047}$)${}_2$As${}_2$: Evidence for a sharp enhancement of spin fluctuations by nematic order
• The magnetic form factor of iron in SrFe2As2
• Magnetic Lattice Dynamics of the Oxygen-Free FeAs Pnictides: How Sensitive are Phonons to Magnetic Ordering?
• Itinerant G-type antiferromagnetic order in SrCr${}_2$As${}_2$
• Determination of the Nature of the Tetragonal to Orthorhombic Phase Transition in SrFe_2As_2 by Measurement of the Local Order Parameter
• Distinct itinerant spin-density waves and local-moment antiferromagnetism in an intermetallic ErPd${}_2$Si${}_2$ single crystal
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction
• Temperature-dependent structure of an intermetallic ErPd${}_2$Si${}_2$ single crystal: A combined synchrotron and in-house X-ray diffraction study
• Magnetoelastic coupling and charge correlation lengths in a twin domain of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ ($x=0.047$): A high-resolution X-ray diffraction study