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This study investigates the changes of magnetic ordering temperature vianano- and mesoscale structural features in an iron arsenide. Although magneticground states in quantum materials can be theoretically predicted from knowncrystal structures and chemical compositions, the ordering temperature isharder to pinpoint due to such local lattice variations. In this work we findsurprisingly that a locally disordered material can exhibit a significantlylarger Neel temperature (TN) than an ordered material of precisely the samechemical stoichiometry. Here, a EuFe2As2 crystal, which is a 122 parent of ironarsenide superconductors, is found through synthesis to have ordering below TN= 195 K (for the disordered crystal) or TN = 175 K (for the ordered crystal).In the higher TN crystals, there are shorter planar Fe-Fe bonds [2.7692(2) Avs. 2.7745(3) A], a randomized in-plane defect structure, and diffusescattering along the [00L] crystallographic direction that manifests as arather broad specific heat peak. For the lower TN crystals, the a-latticeparameter is larger and the in-plane microscopic structure shows defectordering along the antiphase boundaries, giving a larger TN and a highersuperconducting temperature (Tc) upon the application of pressure. Firstprinciples calculations find a strong interaction between c-axis strain andinterlayer magnetic coupling, but little impact of planar strain on themagnetic order. Neutron single-crystal diffraction shows that thelow-temperature magnetic phase transition due to localized Eu moments is notlattice or disorder sensitive, unlike the higher-temperature Fe sublatticeordering. This study demonstrates a higher magnetic ordering point arising fromlocal disorder in 122.

Lattice Disorder Effect on Magnetic Ordering of Iron Arsenides