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Symmetry analysis of the structural and magnetic phase transitions in 122 iron arsenides

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It is evident from the literature that the 122 iron arsenides, XFe2As2 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 CAmca. 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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Document Type: Short Communication

Publication date: 2012-04-01

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