Anisotropic thermal expansion of AEFe2As2 (AE = Ba, Sr, Ca) single crystals

Abstract

We report anisotropic thermal expansion of the parent, AEFe2As2 (AE = Ba, Sr, and Ca), compounds. Above the structural/antiferromagnetic phase transition anisotropy of the thermal expansion coefficients is observed, with the coefficient along the a-axis being significantly smaller than the coefficient for the c-axis. The high temperature (200 K < T < 300 K) coefficients themselves have similar values for the compounds studied. The sharp anomalies associated with the structural/antiferromagnetic phase transitions are clearly seen in the thermal expansion measurements. For all three pure compounds the "average" a-value increases and the c-lattice parameter decreases on warming through the transition with the smallest change in the lattice parameters observed for SrFe2As2. The data are in general agreement with the literature data from X-ray and neutron diffraction experiments.

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• Solidification and loss of hydrostaticity in liquid media used for pressure measurements
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Large Miscibility Gap in the Ba(Mn_xFe_{1-x})2As2 System
• Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals
• Transition to collapsed tetragonal phase in CaFe2As2 single crystals as seen by 57Fe Mossbauer spectroscopy
• Thermal expansion of CaFe2As2: effect of cobalt doping and post-growth thermal treatment
• Anomalous thermal expansion in a CuAl2-type superconductor CoZr2
• Uniaxial negative thermal expansion in a tetragonal V3S-type superconductor IrZr3