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Symmetry analysis of the structural and magnetic phase transitions in 122 iron arsenides
Christopher J Howard1, Michael A Carpenter
1School of Engineering, University of Newcastle, NSW 2308, Australia. chris.howard@newcastle.edu.au
Abstract:
It is evident from the literature that the 122 iron arsenides, XFe(2)As(2) with X = Ca, Sr, Ba or Eu, undergo one or more phase transitions from a higher-temperature paramagnetic tetragonal structure in grey group I4/mmm1' to an antiferromagnetic structure with magnetic space group C(A)mca. Symmetry analysis is used to enumerate the possibilities for the transition (or transitions) between the higher- and lower-symmetry structures, and the results are used as a basis for comment on published experimental results.
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