Orbital Order and Spontaneous Orthorombicity in Iron Pnictides

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In-plane electronic anisotropy of underdoped ‘122’ Fe-arsenide superconductors revealed by measurements of detwinned single crystals (2011, background): “Indeed, the large scattering rate along the a-axis may arise because of scattering from spin fluctuations with large momentum transfer (i.e. by incoherent spin waves) (Turner et al 2009, Chen et al 2010).”
Nematic order in iron superconductors - who is in the driver's seat? (2013, background): “The calculated anisotropy in the Drude weight has the opposite sign to the one observed experimentally [37, 48], whereas the calculated anisotropy in the magnetic scattering rate was shown to agree with experiments, including a signchange of the anisotropy between electron-doped and hole-doped mater”
Superconductivity in iron compounds (2011, background): “There are also theoretical (Lee, Yin, and Ku, 2009; Lv, Wu, and Phillips, 2009; C.-C. Chen et al., 2010; Kontani, Saito, and Onari, 2011) and experimental (Akrap et al., 2009; Dusza et al., 2010; Shimojima et al., 2010) works which propose that the observed magnetic ordering and the structural phase”