Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study

Abstract

Neutron diffraction measurements of a high quality single crystal of CaFe2As2 are reported. A sharp transition was observed between the high temperature tetragonal and low temperature orthorhombic structures at TS = 172.5K (on cooling) and 173.5K (on warming). Coincident with the structural transition we observe a rapid, but continuous, ordering of the Fe moments, in a commensurate antiferromagnetic structure is observed, with a saturated moment of 0.80(5)muB/Fe directed along the orthorhombic a-axis. The hysteresis of the structural transition is 1K between cooling and warming and is consistent with previous thermodynamic, transport and single crystal x-ray studies. The temperature onset of magnetic ordering shifts rigidly with the structural transition providing the clearest evidence to date of the coupling between the structural and magnetic transitions in this material and the broader class of iron arsenides.

submitted to PRB

References in corpus (16)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• First order structural phase transition in CaFe${}_2$As${}_2$
• Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
• Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds
• Spin and Lattice Structure of Single Crystal SrFe2As2
• Structural transition and anisotropic properties of single crystalline SrFe2As2
• Strong coupling between magnetic and structural order parameters in SrFe2As2

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