Broken mirror symmetry, incommensurate spin correlations, and B2g nematic order in iron pnictides

  title={Broken mirror symmetry, incommensurate spin correlations, and 
 nematic order in iron pnictides},
  author={Yiming Wang and Wenjun Hu and Rong Yu and Qimiao Si},
  journal={Physical Review B},
Motivated by growing indications for a distinct form of nematic correlations in the extremely hole doped iron pnictide compounds $A$Fe$_2$As$_2$ ($A$=K,Rb,Cs), we consider spin-driven nematic order in the general case of incommensurate magnetic fluctuations. We classify the nematic order parameters by broken mirror symmetries of the tetragonal $D_{4h}$ point group, and use this scheme to construct a general Ginzburg-Landau theory that links the nematic order to spatial pattern of magnetic… 

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